function overlay(isError) {
	
		htmlToChange = '<' + '!-- Start of DoubleClick Spotlight Tag: Please do not remove--' + '>';
		htmlToChange += '<' + '!-- Activity Name for this tag is:dove richiederla --' + '>';
		htmlToChange += '<' + '!-- Web site URL where tag should be placed: http://dev.www.noverca.it/mynoverca-sim-2-vicino-a-te# --' + '>';
		htmlToChange += '<' + '!-- This tag must be placed within the opening <' + 'bo' + 'dy' + '> tag, as close to the beginning of it as possible--' + '>';
		htmlToChange += '<' + '!-- Creation Date:11/26/2009 --' + '>';
		htmlToChange += '<' + 'SCR' + 'IPT language="JavaScript"' + '>';
		htmlToChange += 'var axel = Math.random()+"";';
		htmlToChange += 'var a = axel * 10000000000000;';
		htmlToChange += 'document.write(\'<' + 'IFR' + 'AME SRC="http://fls.doubleclick.net/activityi;src=2291352;type=acqui822;cat=dover119;ord=1;num=\'+ a + \'?" WIDTH=1 HEIGHT=1 FRAMEBORDER=0' + '><' + '/IFR' + 'AME' + '>\');';
		htmlToChange += '</SCR' + 'IPT' + '>';
		htmlToChange += '<NOSC' + 'RIPT' + '>';
		htmlToChange += '<IFR' + 'AME SRC="http://fls.doubleclick.net/activityi;src=2291352;type=acqui822;cat=dover119;ord=1;num=1?" WIDTH=1 HEIGHT=1 FRAMEBORDER=0' + '></IFRAME' + '>';
		htmlToChange += '</' + 'NOSC' + 'RIPT' + '>';
		htmlToChange += '<' + '!-- End of DoubleClick Spotlight Tag: Please do not remove--' + '>';
		
		a = document.getElementById('doubleclickDynamicScript');
		a.innerHTML = htmlToChange;
		
		if(!isError) { 
				var isError = 0;
			}
		
    var el = $("overlay");
    var el_f = $("login_form");
    var el_v = $("yt_container");
    
    if (window.pageYOffset == undefined){
        // ie
        el_f.style.marginTop = '-5px';
    } else {
        el_f.style.marginTop = '-5px';
    }
    
     el.style.visibility = (el.style.visibility == "visible") ? "hidden" : "visible";
     el_v.style.visibility = (el_v.style.visibility == "hidden") ? "visible" : "hidden";
     
     
     
}