var sectionId="hdr-link-" + section;

function showMain() {
	document.getElementById(sectionId).className="on";
}
function hideMain(id) {
	if (id!=sectionId) {
		document.getElementById(sectionId).className="";
	}
}
function getRandomInt(min, max) {
	return (min >= max) ? max : Math.floor(((max+1 - min)*Math.random())+min);
}