function switch_images(site_root,image_name){
	var xmlhttp;
	xmlhttp=GetXmlHttpObject();
		if (xmlhttp==null)
		  {
		  alert ("Your browser does not support XMLHTTP!");
		  return;
		  }
		  
		var url="/wp-content/plugins/image-viewer/switch_image.php";
		url=url+"?image_name="+image_name;
		
		var obj = document.getElementById('wp_image_viewer_full');
					
		xmlhttp.onreadystatechange=function(){			
			if (xmlhttp.readyState==1)
			  {
				 //obj.innerHTML='&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;loading&nbsp;<img src="/wp-content/plugins/image-viewer/loading.gif" align="absmiddle">';
			  }		  
			if (xmlhttp.readyState==4)
				{
					obj.innerHTML=xmlhttp.responseText;  
				}
		}
		xmlhttp.open("GET",url,true);
		xmlhttp.send(null);
}

function GetXmlHttpObject()
		{
		if (window.XMLHttpRequest)
		  {
		  // code for IE7+, Firefox, Chrome, Opera, Safari
		  return new XMLHttpRequest();
		  }
		if (window.ActiveXObject)
		  {
		  // code for IE6, IE5
		  return new ActiveXObject("Microsoft.XMLHTTP");
		  }
		return null;
}