var dge=document.getElementById;
function cl_expcol(a){
	if(!dge)return;
		document.getElementById(a).style.display = 
		(document.getElementById(a).style.display=='none')?
		'block':'none';
}

function cl_colall(){
	if(!dge)return;
	for(i=1;document.getElementById('ex'+i);i++){
		document.getElementById('ex'+i).style.display='none';
	}
}

sfHover = function() {
	var sfEls = document.getElementById("drop").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);