var timerCTab;
var timerCDef;
function changeToDefaultTabTO() {
    window.clearTimeout( timerCTab);
    timerCDef = window.setTimeout('changeToDefaultTab()',300);
}
function changeTabMenuTO(tnum) {
    window.clearTimeout( timerCDef);
    timerCTab = window.setTimeout('changeTabMenu('+tnum+')',200);
}
function changeTabMenu(tnum) {
    changeTab( tnum);
    showMenu( tnum);
}
function clearDelayTab() {
    window.clearTimeout( timerCTab);
} 
function clearDelayDef() {
    window.clearTimeout( timerCDef);
} 

function getDefaultTab() {
	
	var defaultTab = document.getElementById('mainNav').src;
	defaultTabNumber = defaultTab.substring(defaultTab.length-5,defaultTab.length-4);
}

function changeTab(tabNumber) 
{
	var navImage = document.getElementById('mainNav').src;
	navImageOver = navImage.substring(0,navImage.length-5) + tabNumber + ".gif";
	document.getElementById('mainNav').src = navImageOver ; 
}

function changeToDefaultTab() 
{
	var navImage = document.getElementById('mainNav').src;
	navImageDefault = navImage.substring(0,navImage.length-5) + defaultTabNumber + ".gif";
	document.getElementById('mainNav').src = navImageDefault ;
	showMenu(-1);
}

function showMenu(tabNumber)
{
	var subNav = "subNav" + tabNumber;
	
	hideAllMenu();
	document.getElementById(subNav).style.visibility = "visible";
	
}

function hideAllMenu() {
	
	var subNav;
	
	for (i=1;i<7;i++)
	{
	subNav = "subNav" + i;
	document.getElementById(subNav).style.visibility = "hidden";
	}
	
}