function changeBack(element,image)
{
    lien = "images/backicone/"+image;
	element.style.backgroundImage="url("+lien+")";	
}
	
function rechangeBack(element,couleur) 
{
	element.style.background="#"+couleur;	
}
	
function changeImage(id,image)
{
	document.getElementById(id).src = 'images/layout1/'+image;	
}
function replaceImage(id,image)
{
    document.getElementById(id).src = 'images/layout1/'+image;

}