var timer=setTimeout("show_it()",7000);
var  a = 1;
function show_it()
{
a = a + 1;
if(a < 8)
	{
	var timer=setTimeout("show_it()",7000);
	document['page_banner'].src='images/banners/ban'+a+'.gif';
	}
else
	{//clearTimeout(timer);
	a = 1;
	var timer=setTimeout("show_it()",7000);
	}
}