//Hide and reveal content
		 
		function InsertContent(tid) {
		if(document.getElementById(tid).style.display == "none") {
			document.getElementById(tid).style.display = "";
			}
		else {
			document.getElementById(tid).style.display = "none";
			}
		}
		
		

//this script is only needed for IE browsers. It enables the drop-down

sfHover = function()
 {
   var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++)
	 {
	  sfEls[i].onmouseover=function()
	   {this.className+=" sfhover";
	   }
	  sfEls[i].onmouseout=function()
	   {
 		this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
	   }
     }
}
if (window.attachEvent) window.attachEvent("onload", sfHover);