jQuery(document).ready(function() {
		
		/* randomizza i primi 5 articoli */
		imgHeader=new Array(
			"PORTALEheader_1.jpg",
			"PORTALEheader_2.jpg",
			"/PORTALEheader_3.jpg",
			"PORTALEheader_4.jpg",
			"PORTALEheader_5.jpg",
			"PORTALEheader_6.jpg",
			"PORTALEheader_7.jpg",
			"PORTALEheader_8.jpg"
		);		
	
		var numrand=randRange(1,imgHeader.length)-1;
		/* se non ho un flash ma ho solo l'immagine*/
		
		/* jQuery("#header").attr("style" , "backgroundImage(/contentsmulti/instance1/images/"+imgHeader[numrand]+")"); */
		jQuery("#header").attr("style" , "background-Image:url(/contentsmulti/instance1/images/"+imgHeader[numrand]+")"); 
		
	});
	
	/* genera un numero casuale tra lowVal e HighVal*/
	function randRange(lowVal,highVal) {
	   return Math.floor(Math.random()*(highVal-lowVal+1))+lowVal;
	}