ieVersPlace = navigator.appVersion.indexOf('MSIE') + 5;
ieVers = navigator.appVersion.substr(ieVersPlace,3);
ieVers = parseInt(ieVers);
isIE5plus = ((navigator.appName.indexOf('Microsoft') != -1 && parseInt(ieVers) >= 5)) ? true :false;
var _top = 49;
var _left1 = 41;
var _left2 = 121;
var _left3 = 196;
var _left4 = 320;
if(isIE5plus){
	_top = 37;
	_left1 += 2;
	_left2 += 2;
	_left3 += 2;
	_left4 += 2;
}
// invoke drop-down menus
// PARAMATERS ARE: id, direction of slide-out, left position, top position, width, height
var menus = [
	new ypSlideOutMenu("navmenu1", "down", 40, _top, 180, 200),
	new ypSlideOutMenu("navmenu2", "down", 120, _top, 180, 200),
	new ypSlideOutMenu("navmenu3", "down", 195, _top, 180, 200),
	new ypSlideOutMenu("navmenu4", "down", 319, _top, 180, 200)
];
for (var i = 1; i < menus.length; i++) {
	menus[i].onactivate = new Function("document.getElementById('act" + i + "').className='active';");
	menus[i].ondeactivate = new Function("document.getElementById('act" + i + "').className='';");
}