function GetXmlHttpObject() { 
		var objXMLHttp=null;
		if (window.XMLHttpRequest) {
			objXMLHttp=new XMLHttpRequest();
		} else if (window.ActiveXObject) {
			objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
		return objXMLHttp;
	}	

	var xmlHttpTax;

	function updateTax(myState,myZip,myCountry,billship) {
		xmlHttpTax=GetXmlHttpObject()
		if (xmlHttpTax==null) {
			alert ("Browser does not support HTTP Request");
			return;
		} 
		var url="includes/ajax_tax_update.php";
		url=url+"?myState="+myState;
		url=url+"&myZip="+myZip;
		url=url+"&myCountry="+myCountry;
		url=url+"&billship="+billship;
		url=url+"&sid="+Math.random();
		
		//alert('url = '+url);
		
		xmlHttpTax.onreadystatechange=taxChanged;
		xmlHttpTax.open("GET",url,true);
		xmlHttpTax.send(null);
	} 

	function taxChanged() { 
		if (xmlHttpTax.readyState==4 || xmlHttpTax.readyState=="complete") { 		
			var taxVars=innerHTML=xmlHttpTax.responseText.split('|');		
			if(document.getElementById("allTaxSpan")!=null) {
				document.getElementById('allTaxSpan').innerHTML=taxVars[0];
			}
			if(document.getElementById("grandtotalSpan")!=null) {		
				document.getElementById('grandtotalSpan').innerHTML=taxVars[1];
			}
			if(document.getElementById("allTaxNameSpan")!=null) {
				document.getElementById('allTaxNameSpan').innerHTML=taxVars[2];
			}
		} 
	}