function cheight()
{
	if(document.getElementById('c_area').offsetHeight > document.getElementById('l_nav').offsetHeight)
	{
		var gap = (document.getElementById('c_area').offsetHeight - document.getElementById('l_nav').offsetHeight) + 105;
		document.getElementById('sponsors').style.marginTop =  gap + 'px';
	}
	
	externalLinks();
}

function externalLinks()
{
	if (!document.getElementsByTagName) return;
	
	var anchors = document.getElementsByTagName("a");
	
	for (var i=0; i<anchors.length; i++)
	{
		var anchor = anchors[i];
		var relvalue = anchor.getAttribute("rel");
		
		if (anchor.getAttribute("href"))
		{
			var external = /external/;
			var relvalue = anchor.getAttribute("rel");
			
			if (external.test(relvalue))
			{
				anchor.target = "_blank";
			}
		}
	}
}


function change(id){
     ID = document.getElementById(id);
    
     if(ID.style.display == "")
          ID.style.display = "none";
     else
          ID.style.display = "";
      }