var xmlHttp
function searchUser(str){
    xmlHttp=GetXmlHttpObject()
    if (xmlHttp==null) {
        alert ("Browser does not support HTTP Request")
        return
    }
    var url="searchresult.php"
    url=url+"?q="+str
    url=url+"&sid="+Math.random()
    xmlHttp.onreadystatechange=stateChanged
    xmlHttp.open("GET",url,true)
    xmlHttp.send(null)
}
function stateChanged(){
    if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
        document.getElementById("searchresult").innerHTML=xmlHttp.responseText
    }
}
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;
}