function GetXmlHttpObject()
	{
		var xmlHttp = null;
		try {
	  		xmlHttp = new XMLHttpRequest();
		} catch (e) {  
	  		try {
	    		xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
	  		} catch (e) {
	    		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			}
	  	}
		return(xmlHttp);
	} /*used to detect if the current browser supports the XMLHttpRequest object (used for Ajax functionality)*/
	
	function retrieveGalleryImageInformation(image_id)
	{
	  	var xmlHttp;
		xmlHttp = GetXmlHttpObject();
		
		if (xmlHttp!=null)
		{
		 	xmlHttp.onreadystatechange = function()
		    {
				if (xmlHttp.readyState==4)
					document.getElementById("image_information").innerHTML = xmlHttp.responseText;
			}
				
		    xmlHttp.open("GET","admin/_modules/gallery/front/ajax/gallery.php?image_id=" +image_id,true);
		    xmlHttp.send(null);			
		}
		else
			document.getElementById("image_information").innerHTML = "Your current browser is not compatible with this portfolio page. You should consider upgrading before proceeding.";
	} /*displays image information, Ajax functionality encapsulated in admin/_modules/gallery/front/ajax/gallery.php*/	
	
	function toggleBeforeImage(image)
	{
		document.getElementById("preview").src = "./files/" + image;
	}