function previewLink(linkID,imageLink,videoLink,previewSection) {
	var ajax = getXMLHttpRequestObject();
	if(ajax) {
		var thisLink=document.getElementById(linkID).value;
		/* if the user has entered a link and checked either the video or image radio buttons, get preview */
		if((thisLink != '')&&(thisLink != 'http://'))
		{
			if(thisLink.substring(0,7)=='http://' || thisLink.substring(0,8)=='https://')
			{
				if(document.getElementById(imageLink).checked)
				{
					var linkType=2;
				}
				else if(document.getElementById(videoLink).checked)
				{
					var linkType=3;
				}
				else
				{
					var linkType=1;
				}
				if((linkType == 2)||(linkType == 3))
				{
					document.getElementById(previewSection).style.display = "block";
					document.getElementById(previewSection).innerHTML = '<img src="http://www.10to1.com/Images/Site_Images/animate/w6.gif">';
					ajax.open('GET','http://www.10to1.com/previewLink.php?link='+ escape(thisLink) +"&linkType="+ escape(linkType) +"&" + Math.random());
					ajax.onreadystatechange=function()
					{
						finishPreviewLink(ajax,previewSection);
					}
					ajax.send(null);
				}
				else
				{
					document.getElementById(previewSection).style.display = "none";
				}
			}
			else
			{
				document.getElementById(previewSection).style.display = "block";
				document.getElementById(previewSection).innerHTML = "Links must begin with http://";
			}
		}
		else
		{
			document.getElementById(previewSection).style.display = "none";
		}
	}
}
function finishPreviewLink(ajax,previewSection)
{
	if(ajax.readyState==4)
	{
		if((ajax.status==200)||(ajax.status==304))
		{
			var results=document.getElementById(previewSection);
			results.innerHTML=ajax.responseText;
		}
	}
}