var newwindow;
var intId;
function login(url){
	 var  screenX    = typeof window.screenX != 'undefined' ? window.screenX : window.screenLeft,
	 screenY    = typeof window.screenY != 'undefined' ? window.screenY : window.screenTop,
	 outerWidth = typeof window.outerWidth != 'undefined' ? window.outerWidth : document.body.clientWidth,
	 outerHeight = typeof window.outerHeight != 'undefined' ? window.outerHeight : (document.body.clientHeight - 22),
	 width    = 500,
	 height   = 270,
	 left     = parseInt(screenX + ((outerWidth - width) / 2), 10),
	 top      = parseInt(screenY + ((outerHeight - height) / 2.5), 10),
	 features = (
		'width=' + width +
		',height=' + height +
		',left=' + left +
		',top=' + top
				  );
 
			newwindow=window.open(url,'Login_by_facebook',features);
 
			 if (window.focus) {newwindow.focus()}
			return false;
}
				
function logout(url){
	var  screenX    = typeof window.screenX != 'undefined' ? window.screenX : window.screenLeft,
	 screenY    = typeof window.screenY != 'undefined' ? window.screenY : window.screenTop,
	 outerWidth = typeof window.outerWidth != 'undefined' ? window.outerWidth : document.body.clientWidth,
	 outerHeight = typeof window.outerHeight != 'undefined' ? window.outerHeight : (document.body.clientHeight - 22),
	 width    = 500,
	 height   = 270,
	 left     = parseInt(screenX + ((outerWidth - width) / 2), 10),
	 top      = parseInt(screenY + ((outerHeight - height) / 2.5), 10),
	 features = (
		'width=' + width +
		',height=' + height +
		',left=' + left +
		',top=' + top
				  );
 
			newwindow=window.open(url,'Login_by_facebook',features);
 
			 if (window.focus) {newwindow.focus()}
			return false;
		}