if (navigator.appName != "Netscape") {
	pr_IE = 1;
} else {
	pr_IE = 0;
}
function ShowMainMenu(el) {
	HideMainMenu();
	if (pr_IE) {
		x = window.event.clientX;
		y = window.event.clientY + document.body.scrollTop;
	} else {
		x = el.pageX;
		y = el.pageY;
	}
	if (x<270) x=0;
	document.getElementById('main_menu').style.left = x+20;
	document.getElementById('main_menu').style.top = y+5;
	document.getElementById('main_menu').style.width = "200px";
	document.getElementById('main_menu').style.visibility = "visible";
}
function HideMainMenu(){
	document.getElementById('main_menu').style.visibility = "hidden";
}