function loadPost(url, params, update,atag) {
	if(document.getElementById('compare_count').innerHTML == "(4)") {
		alert("Limit four items for compare.\nTo add another item please remove at least one from the compare cart.");
		return;	
	}
	var http = null;
	if (window.XMLHttpRequest) 
  		http = new XMLHttpRequest();
	else
  		if (window.ActiveXObject) 
     		http = new ActiveXObject('MSXML2.XMLHTTP.3.0');

	http.open("POST", url, true);
	http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http.setRequestHeader("Content-length", params.length);
	http.setRequestHeader("Connection", "close");
	http.onreadystatechange = function() {
		if(http.readyState == 4 && http.status == 200) {
			if(isNaN(http.responseText.replace(',','')))
				cur = http.responseText;
			else if(!isNaN(http.responseText)){
				document.getElementById('compare_count').innerHTML = "(" + http.responseText + ")";
				atag.innerHTML='<font color=\'#DA2D14\' style=\'text-transform:uppercase\'><strong>added to compare</strong></font>';	
			}
		}
	}
	http.send(params);
}