var nbimage= 120;
var width;
var height;
var url;
var alte;
function banniere()
{
numimage= Math.round(Math.random()*(nbimage-1)+1);

if (numimage <= 10) { gotosite = ""; url = "img/01.jpg"; alte = ""; }
if (numimage > 10 && numimage <= 20) { gotosite = ""; url = "img/02.jpg"; alte = ""; }
if (numimage > 20 && numimage <= 30) { gotosite = ""; url = "img/03.jpg"; alte = ""; }
if (numimage > 30 && numimage <= 40) { gotosite = ""; url = "img/04.jpg"; alte = ""; }
if (numimage > 40 && numimage <= 50) { gotosite = ""; url = "img/05.jpg"; alte = ""; }
if (numimage > 50 && numimage <= 60) { gotosite = ""; url = "img/06.jpg"; alte = ""; }
if (numimage > 60 && numimage <= 70) { gotosite = ""; url = "img/07.jpg"; alte = ""; }
if (numimage > 70 && numimage <= 80) { gotosite = ""; url = "img/08.jpg"; alte = ""; }
if (numimage > 80 && numimage <= 90) { gotosite = ""; url = "img/09.jpg"; alte = ""; }
if (numimage > 90 && numimage <= 100) { gotosite = ""; url = "img/10.jpg"; alte = ""; }
if (numimage > 100 && numimage <= 110) { gotosite = ""; url = "img/11.jpg"; alte = ""; }
if (numimage > 110) { gotosite = ""; url = "img/12.jpg"; alte = ""; }

if(gotosite != "")
	{
	document.write ('<a href="' + gotosite + '">');	
	}
document.write('<img src="' + url + '" alt="" class="imgdroite" />')
if(gotosite != "")
	{
	document.write('</a>')
	}
}