var nbimage= 60;
var width;
var height;
var url;
var alte;
function banniere()
{
numimage= Math.round(Math.random()*(nbimage-1)+1);

if (numimage <= 10)
{
gotosite = "";
url = "html/images/home/grazailles_poss.jpg";
alte = "Collège des Grazailles";
}
if (numimage > 10 && numimage <= 20)
{
gotosite = "";
url = "html/images/home/img_0455.jpg";
alte = "Collège Orléans";
}
if (numimage > 20 && numimage <= 30)
{
gotosite = "";
url = "html/images/home/img_0469.jpg";
alte = "Collège Orléans";
}
if (numimage > 30 && numimage <= 40)
{
gotosite = "";
url = "html/images/home/img_0487.jpg";
alte = "Collège Orléans";
}
if (numimage > 40 && numimage <= 50)
{
gotosite = "";
url = "html/images/home/img_2185.jpg";
alte = "Collège des Gâtines";
}
if (numimage > 50 && numimage <= 60)
{
gotosite = "";
url = "html/images/home/eleves_map_final.jpg";
alte = "Collège des Gâtines";
}
if (numimage > 60)
{
gotosite = "";
url = "html/images/home/img_2217.jpg";
alte = "Collège des Gâtines";
}
if(gotosite != "")
	{
	document.write ('<a href="' + gotosite + '">');	
	}
document.write('<img src="' + url + '" alt="' + alte + '" title="' + alte + '"  />')
if(gotosite != "")
	{
	document.write('</a>')
	}
}