var highlightbehavior="TD"

var ns6=document.getElementById&&!document.all
var ie=document.all

function changeto(e,highlightcolor){
source=ie? event.srcElement : e.target
if (source.tagName=="TABLE")
return
while(source.tagName!=highlightbehavior && source.tagName!="HTML")
source=ns6? source.parentNode : source.parentElement
if (source.style.backgroundColor!=highlightcolor&&source.id!="ignore")
source.style.backgroundColor=highlightcolor
}

function contains_ns6(master, slave) { //check if slave is contained by master
while (slave.parentNode)
if ((slave = slave.parentNode) == master)
return true;
return false;
}

function changeback(e,originalcolor){
if (ie&&(event.fromElement.contains(event.toElement)||source.contains(event.toElement)||source.id=="ignore")||source.tagName=="TABLE")
return
else if (ns6&&(contains_ns6(source, e.relatedTarget)||source.id=="ignore"))
return
if (ie&&event.toElement!=source||ns6&&e.relatedTarget!=source)
source.style.backgroundColor=originalcolor
}

function swapImgRestore() { //v3.0
  var i,x,a=document.sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}

function findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function swapImage() { //v3.0
  var i,j=0,x,a=swapImage.arguments; document.sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=findObj(a[i]))!=null){document.sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function setPage(){
	preloadImages('img/b_program1.gif','img/b_speakers1.gif','img/b_registration1.gif','img/b_howto1.gif','img/b_contact1.gif');
}

function toggleActivities(oCheckbox, sTableId){
	oTable = document.getElementById(sTableId);
	oInputs = oTable.getElementsByTagName('input');
	var checkboxes = new Array();
	for (i = 0; i < oInputs.length; i++)
	{
	  if (!oInputs[i].length)
	  {
	    if (oInputs[i].type == 'checkbox')
	      checkboxes[checkboxes.length] = oInputs[i];
	  } else
	  {
	    for(k = 0; k < oInputs[i].length; k++)
	    {
	      if (oInputs[i][k].type == 'checkbox')
	        checkboxes[checkboxes.length] = oInputs[i];
	    }
	  }
	}
	
	if (oCheckbox.checked){
		for (i = 0; i < checkboxes.length; i++)
  		checkboxes[i].checked = true;
		oTable.style.display="inline";
	}
	else {
		for (i = 0; i < checkboxes.length; i++)
  		checkboxes[i].checked = false;
		oTable.style.display="none";
	}
}

function checkState(oMainCheckBox, sTableId){
	//try {
	oTable = document.getElementById(sTableId);
	oInputs = oTable.getElementsByTagName('input');
	var checkedTotal = 0
	var checkboxes = new Array();
	for (i = 0; i < oInputs.length; i++)
	{
	  if (!oInputs[i].length)
	  {
	    if (oInputs[i].type == 'checkbox')
	      checkboxes[checkboxes.length] = oInputs[i];
	  } else
	  {
	    for(k = 0; k < oInputs[i].length; k++)
	    {
	      if (oInputs[i][k].type == 'checkbox')
	        checkboxes[checkboxes.length] = oInputs[i];
	    }
	  }
	}
	for (i = 0; i < checkboxes.length; i++){
  		if(checkboxes[i].checked){
			checkedTotal += 1
		}
	}
	if (checkedTotal==0){
		oTable.style.display = "none";
		if (document.getElementById){
			document.getElementById(oMainCheckBox).checked = false;
		}
		else if (document.all) {
			document.all(oMainCheckBox).checked = false;
		}
	}
	//}
	//catch(e) {
	//alert(e.message);
	//}
}

function uncheckAll(sDivId){
	oDiv = document.getElementById(sDivId);
	oInputs = oDiv.getElementsByTagName('input');
	var checkedTotal = 0
	var checkboxes = new Array();
	for (i = 0; i < oInputs.length; i++)
	{
	  if (!oInputs[i].length)
	  {
	    if (oInputs[i].type == 'checkbox')
	      checkboxes[checkboxes.length] = oInputs[i];
	  } else
	  {
	    for(k = 0; k < oInputs[i].length; k++)
	    {
	      if (oInputs[i][k].type == 'checkbox')
	        checkboxes[checkboxes.length] = oInputs[i];
	    }
	  }
	}
	for (i = 0; i < checkboxes.length; i++)
  	checkboxes[i].checked=false
}

function checkChckbField(sDivId){
	oDiv = document.getElementById(sDivId);
	oInputs = oDiv.getElementsByTagName('input');
	var checkboxes = new Array();
	for (i = 0; i < oInputs.length; i++)
	{
	  if (!oInputs[i].length)
	  {
	    if (oInputs[i].type == 'checkbox')
	      checkboxes[checkboxes.length] = oInputs[i];
	  } else
	  {
	    for(k = 0; k < oInputs[i].length; k++)
	    {
	      if (oInputs[i][k].type == 'checkbox')
	        checkboxes[checkboxes.length] = oInputs[i];
	    }
	  }
	}
	var s = 0
	for (i = 0; i < checkboxes.length; i++){
		if(checkboxes[i].checked==false){
			s++
		}
	}
	if (s == checkboxes.length){
		alert("Please select one or more activities.");
		return false;
	}
	return true;
}