var blanc = new Image();
blanc.src = "slices_img/blanc.gif";

var transp = new Image();
transp.src = "slices_img/transp.gif";

var radical = Math.sqrt(576);

var slices = '<table>';

for(var i=0; i<radical; i++) {
	slices += '<tr>';
	for(var j=1; j<=radical; j++) {
		var nb = radical*i + j;
		slices += '<td><img src="slices_img/blanc.gif" width="20" height="20" alt="" onmouseover="this.src=\'slices_img/transp.gif\';" /><\/td>';
	}
	slices += '<\/tr>';
}
slices += '<\/table>';