function Inint_AJAX() {
   try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {} //IE
   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {} //IE
   try { return new XMLHttpRequest(); } catch(e) {} //Native Javascript
   alert("XMLHttpRequest not supported")
   return null
}
//-------------------------------------------
function getRequestBody(oForm) {
    var aParams = new Array();
    
    for (var i=0 ; i < oForm.elements.length; i++) {
        var sParam =encodeURIComponent(oForm.elements[i].name);
        sParam += "=";
        sParam += encodeURIComponent(oForm.elements[i].value);
        aParams.push(sParam);
    } 
    return aParams.join("&");
}
//-------------------------------------------
function trim(str)
{
 return str.replace(/^\s+|\s+$/g, ''); 
}