function setHeight(value) {
	value = Math.round(value);
	value+=10;
	if(value<740) value=740;
	var div = document.getElementById("rayonfrais");
	div.height= value;
	
}
function mouseWheel(delta) {
	value = -delta * 15;
	window.scrollBy(0,value);
}

function scrollToTop() {

	window.scrollTo(0, 0);

}