// JavaScript Document

function resets(i){
	var ajaxRequest;    
		try{
			ajaxRequest = new XMLHttpRequest();
		} catch (e){
			try{
				ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try{
					ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e){
					alert("Ajax is required for this function to work!");
					return false;
				}
			}
		}
	
		ajaxRequest.onreadystatechange = function(){
		   if(ajaxRequest.readyState == 4){
			   document.getElementById('extsion').innerHTML = ajaxRequest.responseText;
		   }
		 }
		 
		document.getElementById('extsion').innerHTML = "Loading extended " + i + " options...";
		ajaxRequest.open("GET", i + "extent.php");
		ajaxRequest.send(null);
		
		
}

function screenname_valid(username){
	if(username.match(/^[a-zA-Z0-9_]{3,16}$/)) {
    	return true;
  	} else {
		return false;
	}
}

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