function toggleSection(input) {
    var data="data";
    var text="text";
    var link="link";
    var inputdata=data+input;
    var inputtext=text+input;
    var inputlink=link+input;
    
    var datablock = document.getElementById(inputdata);
    if(datablock==null){
        return;
    }
    var textblock = document.getElementById(inputtext);
    var linkblock = document.getElementById(inputlink);
    
    for (var i=1; i<5; i++) 
    { 
        var datanone=data+i;
        var textnone=text+i;
        var linknone=link+i;
       
        var blockdata = document.getElementById(datanone);
        var blocktext = document.getElementById(textnone);
        var blocklink = document.getElementById(linknone);
        blocklink.className = ""; 
        blockdata.style.display = "none";
        blocktext.style.display = "none";
        
    }
    
    linkblock.className = "selected"; 
    datablock.style.display = "block";
    textblock.style.display = "block";
}


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