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 = "img/pict1.jpg";
alte = "t1";
}
if (numimage > 10 && numimage <= 20)
{
gotosite = "";
url = "img/pict2.jpg";
alte = "t2";
}
if (numimage > 20 && numimage <= 30)
{
gotosite = "";
url = "img/pict3.jpg";
alte = "t3";
}
if (numimage > 30)
{
gotosite = "";
url = "img/pict4.jpg";
alte = "t4";
}
if(gotosite != "")
	{
	document.write ('<A HREF="' + gotosite + '">');	
	}
document.write('<IMG SRC="' + url + '" ALT="' + alte + '" BORDER=0 width=100 height=75>')
if(gotosite != "")
	{
	document.write('</A>')
	}
}