function getElement(id)
{
	if(document.getElementById) {
		return(document.getElementById(id));
	}
	else if(document.all) {
		return(document.all[id]);
	}
	alert("Inkompatibler Web-Browser!");
}

function subMenu(item)
{
	mainMenu = new Array("products", "company");
	for(var i = 0; i < mainMenu.length; i++) {
		getElement("sub_" + mainMenu[i]).style.display = "none";
	}
	var x = getElement("btn_" + item).offsetLeft - getElement("container").offsetLeft - 20;
	getElement("sub").style.margin = "0 0 0 " + x + "px";
	getElement("sub_" + item).style.display = "inline";
}