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 check_login(val) 
{ 
	var req = Inint_AJAX();
     req.onreadystatechange = function () { 
          if (req.readyState==4) {
               if (req.status==200) {
				  document.getElementById("chek").innerHTML=req.responseText; 
               } 
          }
     };	
	req.open("GET","ajax.php?act=ck_login&val="+val);
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=tis-620"); 
    req.send(null);
}