function redim() {
	var margins = 61;
	var motif = 64;
	var pageHeight = document.getElementById("body").clientHeight;
	var coef = Math.floor((pageHeight-margins)/motif);
//	if (coef*motif+margins<pageHeight) coef++;
	document.getElementById('pageHeight').height = Math.max(coef*motif,6*motif)+margins;
}