var showVal = function(str){
		window.document.getElementById('res_captcha').innerHTML=str;
	}
	
	function validateCaptcha(val){
		var strDomain='';
		window.document.getElementById('res_captcha').innerHTML="Checking Code...";
		var ajax = new Ajax();
		ajax.doGet(strDomain+"chkCaptcha.php?act=chk&val="+val,showVal,'text');
	}