function setBackground()
{
	body = document.getElementsByTagName('body');
	bodyStyle = body[0].style;
	
	if(bodyStyle.bandes != 1 )
	{
		bodyStyle.bandes = 1;
		bodyStyle.backgroundImage = "url(../img/fond.gif)" ;
	}
	else
	{
		bodyStyle.bandes = 0;
		bodyStyle.backgroundImage = "none" ;
	}

}