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

if (window.attachEvent) window.attachEvent("onload", sfHover);



function loadHighlightsImages() {

var code3 = '<a href="#" onclick="javascript:showlayer(\'chatLayer\')"><img src="http://libdata.macalester.edu/newsite/images/openchat.png"  border="0" id="openbutton" alt="Chat with a library staff member"/></a>';document.getElementById('chatbubble').innerHTML = code3;}

function showlayer(layer){
var myLayer = document.getElementById(layer).style.display;
	var closethis = "hidden_search";
	var closethat = "hidden_subject_limit";
	var closelayer = "";
if(myLayer=="none"){
document.getElementById(layer).style.display="block";
	if(layer == closethis) { 
			closelayer = closethat; 
			document.getElementById(closelayer).style.display="none";
		} else if(layer = closethat) { 
			closelayer = closethis;
			document.getElementById(closelayer).style.display="none";
		}
} else {
document.getElementById(layer).style.display="none";
}
}
function closelayer(layer) {
	document.getElementById(layer).style.display="none";
}




function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

function checkCookie()
{
username=getCookie('username');
if (username!=null && username!="")
  {
  alert('Welcome again '+username+'!');
  }
else
  {
  username=prompt('Please enter your name:',"");
  if (username!=null && username!="")
    {
    setCookie('username',username,365);
    }
  }
}