function getXMLHTTP() { //fuction to return the xml http object 
    var xmlhttp=false; 
    try{ 
        xmlhttp=new XMLHttpRequest(); 
    } 
    catch(e){ 
        try{ 
            xmlhttp= new ActiveXObject("Microsoft.XMLHTTP"); 
        } 
        catch(e){ 
            try{ 
                xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); 
            } 
            catch(e1){ 
                xmlhttp=false; 
            } 
        } 
    } 
 
    return xmlhttp; 
}

function updateAltViews( newval ) 
{ 
    var val = ""; 
    var s = document.getElementById('altimages'); 
    strURL = "loadaltimages.php?key=" + newval; 
    var req = getXMLHTTP(); // fuction to get xmlhttp object 
    if (req) 
    { 
        req.onreadystatechange = function() 
        { 
            if (req.readyState == 4) { //data is retrieved from server 
                if (req.status == 200) { // which reprents ok status 
                    s.innerHTML=req.responseText; 
                } 
                else 
                { 
                    alert("There was a problem while using XMLHTTP:\n"); 
                } 
            } 
        } 
        req.open("GET", strURL, true); //open url using get method 
        req.send(null); 
    } 
}