vbwnaqqn=xppr('home-off.jpg');
vbwnaqqo=xppr('home-on.jpg');
vb4naqqn=xppr('about-off.jpg');
vb4naqqo=xppr('about-on.jpg');
vbznaqqn=xppr('membership-off.jpg');
vbznaqqo=xppr('membership-on.jpg');
vbunaqqn=xppr('publications-off.jpg');
vbunaqqo=xppr('publications-on.jpg');
vbvnaqqn=xppr('events-off.jpg');
vbvnaqqo=xppr('events-on.jpg');
vbynaqqn=xppr('career-off.jpg');
vbynaqqo=xppr('career-on.jpg');
vbxnaqqn=xppr('sponsors-off.jpg');
vbxnaqqo=xppr('sponsors-on.jpg');

var btIdPref='vb';

function xppr(im){
	var i=new Image();
	i.src='/images/'+im;
	return i;
};

function xpe(id){
	x=id.substring(0,id.length-1);
	if(document[btIdPref+x])
		document[btIdPref+x].src=eval(btIdPref+id+'.src');
		return false;
};

var hideTimeout=300,menuContId='xpMenuCont',ulIdPref='vbUL_',imgIdPref='xpi_';

function xpinit(){
	isDOM=document.getElementById;
	isOp=isO5=window.opera&&isDOM;
	isOp7=isOp&&document.readyState;
	isIE=document.all&&document.all.item&&!isOp;
	isNS4=document.layers;
	isMz=isDOM&&navigator.appName=="Netscape";
	document.write('<div id="'+menuContId+'" ></div>');
	
	var ULs=document.getElementsByTagName('UL');
	for(var i=0,cnt=ULs.length;i<cnt;i++)
	if(ULs[i].id&&(ULs[i].id.substring(0,ulIdPref.length)==ulIdPref)&&!((ULs[i].parentNode)&&(ULs[i].parentNode.parentNode)&&(ULs[i].parentNode.parentNode.id.substring(0,ulIdPref.length)==ulIdPref)))
	{xpCreateMenu(ULs[i],0,0);};
};
xpinit();

function xpObjectSize(o){
var w=(isOp&&!isOp7)?o.style.pixelWidth:isNS4?o.clip.width:o.offsetWidth,h=(isOp&&!isOp7)?o.style.pixelHeight:isNS4?o.clip.height:o.offsetHeight;return{x:w,y:h};};

function xpClientSize(){
var x=0,y=0,w=0,h=0,doc=document,win=window,cond=(!doc.compatMode||doc.compatMode=='CSS1Compat')&&!win.opera&&doc.documentElement;
if(cond&&doc.documentElement.clientHeight)h=doc.documentElement.clientHeight;
else if(doc.body&&doc.body.clientHeight)h=doc.body.clientHeight;
else if(xpDef(win.innerWidth,win.innerHeight,doc.width)
)
{h=win.innerHeight;
if(doc.width>win.innerWidth)h-=16;};
if(cond&&doc.documentElement.clientWidth)w=doc.documentElement.clientWidth;
else if(doc.body&&doc.body.clientWidth)w=doc.body.clientWidth;
else if(xDef(win.innerWidth,win.innerHeight,doc.height)
)
{w=win.innerWidth;
if(doc.height>win.innerHeight)w-=16;};
if(win.document.documentElement&&win.document.documentElement.scrollLeft)x=win.document.documentElement.scrollLeft;
else if(win.document.body&&xpDef(win.document.body.scrollLeft))x=win.document.body.scrollLeft;if(win.document.documentElement&&win.document.documentElement.scrollTop)y=win.document.documentElement.scrollTop;
else if(win.document.body&&xpDef(win.document.body.scrollTop))y=win.document.body.scrollTop;
return{x:x,y:y,w:w,h:h};
};

function xpDef(){
for(var i=0;i<arguments.length;++i)
{if(typeof(arguments[i])=='undefined')return false;};
return true;
};

function xppos(obj){
var l=0,t=0;
while(obj){l+=obj.offsetLeft;t+=obj.offsetTop;obj=obj.offsetParent;};
if(document.body)with(document){if(body.leftMargin)l-=body.leftMargin;if(body.topMargin)t-=body.topMargin};return{x:l,y:t};
};

function xpCreateMenu(ulParent,iParent,level){
var menuCont=document.getElementById(menuContId),oMenu=document.createElement('div');menuCont.appendChild(oMenu);
var oTable=document.createElement('table');
oMenu.appendChild(oTable);
oMenu.id=ulParent.id+'tbl';
oMenu.className=ulParent.className;
oMenu.style.position='absolute';
oMenu.iParent=iParent;
oMenu.level=level;
oMenu.style.zIndex=9+oMenu.level;
oTable.cellSpacing=0;
oMenu.onmouseover=function(){xpsmover(this)};
oMenu.onmouseout=function(){xpsmout(this)};
oMenu.ClearMenuMark=function(){
for(var j=0;j<this.childNodes[0].rows.length;j++){
p=this.childNodes[0].rows[j];
if(p.tagName=='TR'){
p.className=p.className.replace('over','');
if(p.className.indexOf('popup')<0)p.clrOverImg();};};};oMenu.smShown=0;
for(var i=0,cntLI=ulParent.childNodes.length;i<cntLI;i++){
var oLI=ulParent.childNodes[i];
if(oLI.tagName=='LI'){
var oItem=oTable.insertRow(-1);
oItem.menu=oMenu;oItem.setPopup=function(){this.className+=' popup';};
oItem.clrPopup=function(){this.className=this.className.replace('popup','');
if(this.className.indexOf('over')<0)this.clrOverImg();};
oItem.clrOverImg=function(){
if(this.Img)this.Img.style.display='inline';
if(this.ImgOver)this.ImgOver.style.display='none';
if(this.ImgArrow)this.ImgArrow.style.display='inline';
if(this.ImgArrowOver)this.ImgArrowOver.style.display='none'};oItem.className=oLI.className;
var InnerAnchor=0;
oItem.Img=null;
oItem.ImgOver=null;
var InnerUl=0;
oItem.ImgArrow=null;
oItem.ImgArrowOver=null;
for(var j=0;j<oLI.childNodes.length;j++)
if(oLI.childNodes[j].tagName=='A')InnerAnchor=oLI.childNodes[j];
else if(oLI.childNodes[j].tagName=='IMG'){
if(!InnerAnchor){
if(!oItem.Img)oItem.Img=oLI.childNodes[j];
else oItem.ImgOver=oLI.childNodes[j]}
else{
if(!oItem.ImgArrow)oItem.ImgArrow=oLI.childNodes[j];
else oItem.ImgArrowOver=oLI.childNodes[j]};}
else if(oLI.childNodes[j].tagName=='UL')InnerUl=oLI.childNodes[j];
if(InnerAnchor||InnerUl||oItem.ImgArrow){
var oTDIMG=oItem.insertCell(-1),oTDLabel=oItem.insertCell(-1),oTDArrow=oItem.insertCell(-1);
oTDIMG.style.borderRightWidth='0px';
oTDLabel.style.borderRightWidth='0px';
oTDLabel.style.borderLeftWidth='0px';
oTDArrow.style.borderLeftWidth='0px';
oTDIMG.style.paddingRight='4px';
oTDLabel.style.paddingRight='4px';
oTDLabel.style.paddingLeft='4px';
oTDArrow.style.paddingLeft='4px';
if(oItem.Img)oTDIMG.appendChild(oItem.Img);
else oTDIMG.innerHTML='&nbsp;';if(oItem.ImgOver){oItem.ImgOver.style.display='none';oTDIMG.appendChild(oItem.ImgOver);};
if(InnerAnchor){oTDLabel.appendChild(InnerAnchor);oItem.ItemLink=InnerAnchor;oItem.onclick=function(){
if(this.ItemLink.click)this.ItemLink.click();
else if(this.ItemLink.onclick)this.ItemLink.onclick();
else window.location.href=this.ItemLink.href};}
else oTDLabel.innerHTML='&nbsp;';oItem.onmouseover=function(){
this.menu.ClearMenuMark();this.className+=' over';
if(this.ImgOver){this.Img.style.display='none';this.ImgOver.style.display='inline'};
if(this.ImgArrowOver){this.ImgArrow.style.display='none';this.ImgArrowOver.style.display='inline'};
if(this.smPopupId)xpshowmenu(this.smPopupId,1,this);
else if(this.menu.smShown)xpStartTimeOut(this.menu.smShown);};oItem.onmouseout=function(){
this.menu.ClearMenuMark();};if(InnerUl){oTDArrow.className='arrow';if(oItem.ImgArrow){oTDArrow.appendChild(oItem.ImgArrow);
if(oItem.ImgArrowOver){oItem.ImgArrowOver.style.display='none';oTDArrow.appendChild(oItem.ImgArrowOver)}}
else{
if(typeof(arrowChar)!='undefined'&&arrowChar){oTDArrow.appendChild(document.createElement('a'));oTDArrow.lastChild.innerHTML=arrowChar;}
else oTDArrow.innerHTML='&nbsp;';};oItem.smPopupId=xpCreateMenu(InnerUl,oItem,level+1);}
else oTDArrow.innerHTML='&nbsp;';}
else{
var oTD=oItem.insertCell(-1);oTD.colSpan=3;oTD.innerHTML='<div></div>';};};};return oMenu.id;};

function xpshow(ind,isVertical,iParent){
xpshowmenu(ulIdPref+ind+'tbl',isVertical,iParent);};

function xpshowmenu(menuID,isVertical,iParent){
var menu=document.getElementById(menuID);
if(!menu)return;
if(menu.style.visibility=='visible'){xpStopTimeOut(menu);return;};
if(iParent&&iParent.menu&&iParent.menu.smShown)xphide(iParent.menu.smShown.id);
if(!menu.level&&(ShownMenu!=menu))xphide(ShownMenu.id);
if(!menu.level)xobtn=menuID.replace(ulIdPref,'').replace('tbl','');
var parentObj;
if(iParent.tagName=='A'){parentObj=iParent.parentNode;}
else parentObj=iParent;
var pos=xppos(parentObj),size=xpObjectSize(parentObj);menu.goMenuX=1;menu.goMenuDx=1;
if(menu.level>0){menu.goMenuX=menu.iParent.menu.goMenuX;menu.goMenuDx=menu.iParent.menu.goMenuDx;
};menu.style.overflow='visible';menu.style.height='auto';menu.style.width='auto';menu.style.left='0px';menu.style.top='0px';
var parentAbs=xppos(menu),WinSize=xpClientSize(),menuSize=xpObjectSize(menu),CalcedPos=xp_CalcMenuPos(WinSize.y,WinSize.h,pos.y,size.y,menuSize.y,menu.goMenuDx,isVertical);menu.goMenuDx=CalcedPos.align;
if(isOp&&!menu.OrigWidth)menu.OrigWidth=menu.clientWidth;
if(CalcedPos.size<menuSize.y){menu.style.overflow='auto';
if(isIE)menu.style.overflowX='visible';
if(isIE)menu.style.width=menu.offsetWidth+17+'px';
else if(isMz)menu.style.magrinRight=20;menu.style.height=CalcedPos.size+'px';menu.scrollTop=0;menu.scrollLeft=0;
if(isOp)menu.style.width=menu.OrigWidth+'px';}
else{};
menu.style.top=CalcedPos.xy-parentAbs.y+'px';menuSize=xpObjectSize(menu);CalcedPos=xp_CalcMenuPos(WinSize.x,WinSize.w,pos.x,size.x,menuSize.x,menu.goMenuX,!isVertical);menu.goMenuX=CalcedPos.align;
if(CalcedPos.size<menuSize.x)
if(menu.goMenuX>0)CalcedPos.xy-=(menuSize.x-CalcedPos.size);menu.style.left=CalcedPos.xy-parentAbs.x+'px';menu.style.visibility='visible';
if(!menu.level)ShownMenu=menu;
else{iParent.menu.smShown=menu;iParent.setPopup();};
};

function xp_CalcMenuPos(screenXY,screenSize,parentXY,parentSize,size,align,oHoriz){
var xy=parentXY,newSize=size,newAlign=align,space=5;
if((align==0)&&(!oHoriz))align=1;
if(!oHoriz){
if(((newAlign>=0)&&(parentXY+parentSize+size>screenSize+screenXY-space))||((newAlign<0)&&(parentXY-size<space))){
if(parentXY-screenXY>screenSize+screenXY-(parentXY+parentSize))newAlign=-1;
else newAlign=1;};
if(newAlign>=0){xy=parentXY+parentSize;
if(screenSize+screenXY-space-xy<newSize)newSize=screenSize+screenXY-space-xy;}
else{xy=parentXY-newSize;if(xy-screenXY<space){xy=space+screenXY;newSize=parentXY-space-screenXY;};};}
else{
if(newSize>screenSize-2*space){xy=space+screenXY;newSize=screenSize-2*space;}
else{xy=parentXY+parentSize/2-newSize/2+newAlign*(newSize/2-parentSize/2);
if(xy<space+screenXY){newAlign=1;xy=space+screenXY;};
if(xy+size>screenSize+screenXY-space){newAlign=-1;xy-=xy+newSize-(screenSize+screenXY-space);};};
};

return{xy:xy,size:newSize,align:newAlign};};

function xphide(menuId){
var menu=document.getElementById(menuId);
if(!menu)return;
if(menu.style.visibility=='visible'){
if(menu.smShown)xphide(menu.smShown.id);menu.ClearMenuMark();menu.style.visibility='hidden';
if(menu.level==0){xpe(xobtn+'n');
};
menu.smShown=0;if(menu.iParent)menu.iParent.clrPopup();
if(menu.hideTimer){clearTimeout(menu.hideTimer);menu.hideTimer=null;
};
};
};

function xpsmout(sender){
if(!sender)return;
xpStartTimeOut(ShownMenu)
};

function xpsmover(menu){
if(!menu)return;xpStopTimeOut(menu);
};

function xpStopTimeOut(menu){
for(var o=menu;o;o=o.iParent?o.iParent.menu:0)
if(o.hideTimer)o.hideTimer=clearTimeout(o.hideTimer);
};

function xpStartTimeOut(menu){
for(var o=menu;o;o=o.smShown)
{var code='xphide("'+o.id+'");';
if(!o.hideTimer&&o.id)o.hideTimer=setTimeout(code,hideTimeout);};
};

var ShownMenu=0,xobtn=null;