function changePanel(val)
	{
	  //for every button/panel we have...
	  var i=1;
	  while(document.getElementById("panel"+i)!=null)
	  {
		if (i==val) //this is our panel, change the button image and make the panel visible.
		{
		document.getElementById("panel"+i).style.display="block";
		document.getElementById("tab"+i).setAttribute("class","selected");
		document.getElementById("tab"+i).className="selected";
		}
		else  //this isn't our panel, hide the panel and change the button image to off.
		{
		document.getElementById("panel"+i).style.display="none";		
		document.getElementById("tab"+i).setAttribute("class","");
		document.getElementById("tab"+i).className="";
		}
		i=i+1;
	  }
	}