function makeArray(n) {
		this.length = n;
		for (var i=1; i<=n; i++) {
			this[i] = ""; 
		}
		return this;
	}
	var i;
	
function imagealeatoire() {
		i = Math.floor(5 * Math.random() + 1);
		document.getElementById("slogan").style.backgroundImage = image[i];
	}

image = new makeArray(5);
image[1]="url(/images/slogan1.gif)";
image[2]="url(/images/slogan2.gif)";
image[3]="url(/images/slogan3.gif)";
image[4]="url(/images/slogan4.gif)";
image[5]="url(/images/slogan.gif)";