var nbimage= 40;
var width;
var height;
var url;
var alte;
function banniere()
{
numimage= Math.round(Math.random()*(nbimage-1)+1);
if (numimage <= 10)
{
gotosite = "";
url = "images2/un.jpg";
alte = "location1";
}
if (numimage > 10 && numimage <= 20)
{
gotosite = "";
url = "images2/deux.jpg";
alte = "location2,";
}
if (numimage > 20 && numimage <= 30)
{
gotosite = "";
url = "images2/trois.jpg";
alte = "location3";
}
if (numimage > 30 && numimage <= 40)
{
gotosite = "";
url = "images2/quatre.jpg";
alte = "location4";
}
if(gotosite != "")
	{
	document.write ('<a href="' + gotosite + '">');	
	}
document.write('<img src="' + url + '" ALT="' + alte + '" border=0>')
if(gotosite != "")
	{
	document.write('</a>')
	}
}