// enter text field set
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 checkimg(src,act,val) {
	//alert(src+"-"+act+"-"+val.value);
	
     var req = Inint_AJAX();
     req.onreadystatechange = function () { 
        
		 if (req.readyState==4) {
               if (req.status==200) {
				  //alert(req.responseText);
				  document.getElementById(src).innerHTML=req.responseText; 
				  }
               } 
     };	
	req.open("GET", "ajax_pic.php?act="+act+"&id="+val.value); 
	 // alert(src+act+val.value); 
     req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=tis-620"); // set Header
     req.send(null);
	 }