function goTab(url) {
	new Ajax.Updater(	'maincontent', 
						url, 
						{ 
							method:'post', 
							onComplete:
								function(){ 
									$('loading').style.display = 'none';
									setTimeout("tooltipX();",500);

								}, 
							onLoading:
								function(){ 
									$('loading').style.display = '';
								}, 
							asynchronous:true, 
							evalScripts:true
						}
					);
}