function checkavailability(val){

	var ajaxRequest2;  // The variable that makes Ajax possible!
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest2 = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest2 = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest2 = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest2.onreadystatechange = function(){
		if(ajaxRequest2.readyState == 4){
			//alert(ajaxRequest.responseText);
			document.getElementById('available').innerHTML = ajaxRequest2.responseText;
		}
	}
	
	var queryString = "?username=" + val;
	ajaxRequest2.open("GET", "available.php" + queryString, true);
	ajaxRequest2.send(null); 
}