function XmlHttpRequest(url, postData , elementId)
{
    var _url = url;
    var _postData = postData;
    var _elementId = elementId;
    
    function GetReqObj()
    {
	    var a = null;
	    try
	    {
		    a = new ActiveXObject("Msxml2.XMLHTTP");
	    }
	    catch( b )
	    {
		    try
		    {
			    a = new ActiveXObject("Microsoft.XMLHTTP");
		    }
		    catch( c )
		    {
			    a = null;
		    }
	    }
	    if(!a && typeof(XMLHttpRequest)!="undefined")
	    {
		    a = new XMLHttpRequest();
	    }
	    return a;
    }
    
    this.LoadDoc = function(functionName,arrayofParameters)
    {
	    var req = GetReqObj();
	    req.open("POST", _url, true);
        req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        req.onreadystatechange = function()
        {
            if (req.readyState == 4 && req.status == 200) 
            {
                if (req.responseText)
                {       
                    if( functionName!=null )
                    {
                        if(arrayofParameters!=null)
                        {
                            var tmpStr='';
                            for (var i = 0; i < arrayofParameters.length; i++)
                            {
                                tmpStr = tmpStr + "," + "arrayofParameters[" + i + "]";
                            }
                            tmpStr = functionName + "('" + req.responseText + "'" + tmpStr + ");";  
                            eval(tmpStr);                                       
                        }
                        else
                        {
                           functionName(req.responseText);
                        }
                    }
                    else
                    {
                        var div = document.createElement("div");
                        div.innerHTML= req.responseText;;
                        document.getElementById(_elementId).innerHTML=div.innerHTML;
                    }
                    req = null;
                }
            }
        }        
        req.send(_postData);    
    }
}