function checkNick(service) {
	var jsQuery;
	
	try{
		jsQuery = new XMLHttpRequest();
	} catch (e){
		try{
			jsQuery = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				jsQuery = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				return false;
			}
		}
	}
	
	jsQuery.onreadystatechange = function(){
		if(jsQuery.readyState == 4){
			if("1" == jsQuery.responseText) {
				document.forms[0].nick.style.backgroundColor = 'red';
				document.forms[0].nick.style.fontWeight = 'bold';
			}
			else {
				document.forms[0].nick.style.backgroundColor = 'white';
				document.forms[0].nick.style.fontWeight = 'normal';
			}
		}
	}
	
	var nick = document.forms[0].nick.value;
	
	jsQuery.open("GET", "../checknick.php?nick="+nick+"&service="+service, true);
	jsQuery.send(null); 
}