function mainWidth(){
////////////definisco le dimensioni massime
	var x = document.body.offsetWidth;	
	var tg = document.all ? document.all.container : document.getElementById("container");
	//tg.style.width = (x >= 1100) ? "1020px" : (x >= 1000 ? "950px" : "760px");	
	tg.style.width = x >= 1000 ? "950px" : "740px";
}
function popup(str,w,h){
//////apre una popup
 winz = window.open(str,'popup','scrollbars=1,resizable=1,width='+w+',height='+h+',status=no,location=no,toolbar=0');
 wr= (screen.width / 2)-(w/2);
 tr= (screen.height / 2)-(h/2);
 winz.moveTo(wr,tr);
}