var xmlHttp

function preview() {
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null) {
		alert ("Browser does not support HTTP Request")
		return
	}
	var url="preview.php"
	url=url+"?id="+document.getElementById('fid').value
	url=url+"&file="+document.getElementById('file').value
	url=url+"&custom="+document.getElementById('custom').value
	url=url+"&size="+document.getElementById('size').value
	url=url+"&family="+document.getElementById('family').value
	function stateChanged() { 
		if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
			document.getElementById("preview").innerHTML=xmlHttp.responseText
		}
	}
	xmlHttp.onreadystatechange=stateChanged
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function GetXmlHttpObject() {
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e) {
		//Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}