function initMainNavTabsRollover() {
	if (document.getElementById('mainNavTabs') && !(browser.isIE && browser.versionMajor<7)) {
		var tabRow = document.getElementById('mainNavTabs');
		var tabs = tabRow.getElementsByTagName('img');
		for (var i=0;i < tabs.length;i++) {
			tabs[i].onmouseover = function(){ if (this.className.replace(/\s+$/,"") != 'aPNG tab tabActive') this.src = this.src.replace(new RegExp('_up.png'), "_over.png"); }
			tabs[i].onmouseout = function(){ if (this.className.replace(/\s+$/,"") != 'aPNG tab tabActive') this.src = this.src.replace(new RegExp('_over.png'), "_up.png"); }
		}
	}
}

function initSubTabsRollover() {
	if (document.getElementById('subTabs')){
		var subtabRow = document.getElementById('subTabs');
		var subtabs = subtabRow.getElementsByTagName('td');
		for (var i=0;i<subtabs.length;i++) {
			subtabs[i].onmouseover = function(){ appendThis(this,' subtabOver');}
			subtabs[i].onmouseout = function(){ unappendThis(this,' subtabOver');}
		}
	}
}