function checkUname(str)
{
	
	if(str == '')
	{
			
		document.getElementById('okname').value = '1';
		document.getElementById('responseUsername').innerHTML = '<img src="img/nok.jpg" />';
	
	}
	else
	{
	
		if(!alphanumeric(str))
		{
			
			document.getElementById('okname').value = '1';
			document.getElementById('responseUsername').innerHTML = '<img src="img/nok.jpg" />';
		
		}
		else
		{
			document.ajaxer.request('verifier.php?uname='+str,{update:'responseUsername',loading:false});
		}
	
	}
	
	
}

function alphanumeric(alphane)
{
	var numaric = alphane;
	for(var j=0; j<numaric.length; j++)
		{
		  var alphaa = numaric.charAt(j);
		  var hh = alphaa.charCodeAt(0);
		  if((hh > 47 && hh<58) || (hh > 64 && hh<91) || (hh > 96 && hh<123))
		  {
		  }
		else	{
			 return false;
		  }
		}
 return true;
}