function keyCheck(e){
	var key = (window.event) ? event.keyCode : e.keyCode;

	if(typeof(pressed_keys)=='undefined'){
		pressed_keys="";
	}

	if(key==27){
		pressed_keys = key;
	} else if(key == 76){
		pressed_keys = pressed_keys+""+key;
	}

	if (key !=27  && key !=76) {
	pressed_keys = "";
	}

	if (pressed_keys != "") {
		aux = new String(pressed_keys);
		if (aux.indexOf('2776') != -1) {
			pressed_keys = "";
			returnURL = location.href;
			loginURL = "/login.html";
			if(returnURL.indexOf('?') != -1){
				location.href=loginURL + "&ru=" + escape(returnURL);
			} else {
				location.href=loginURL + "?ru=" + escape(returnURL);
			}
		}
    }
}

function setKeyCheck(){
	document.onkeydown=keyCheck;
}