var objNavMenu = null;
var prevObjNavMenu = null;
var prevObjDropMenu = null;

var bgLinkColor = '#C3D6A8';
var bgLinkHover = '#ffffff';
var bgLinkActive = '#89A666';
var linkColor = '#1F200D';
var linkHover = '#1F200D';
var linkActive ='#ffffff';

var isIE = null;

if(navigator.appName.indexOf('Microsoft Internet Explorer') != 1) isIE=1;

function initDropMenu() {
		document.onclick = hideDropMenu;
		for(i=1;i<=numDropMenu; i++){	
			menuName = 'dropMenu'+i;
			navName = 'navMenu'+i;
			objDropMenu = document.getElementById(menuName);
			objNavMenu = document.getElementById(navName);
			objDropMenu.style.visibility = 'hidden';
			objNavMenu.onmouseover = menuHover;
			objNavMenu.onmouseout = menuOut;
			objNavMenu.onclick = showDropMenu;
		}
		objNavMenu = null
		return;
}

function menuHover(e){
	document.onclick = null;
	hoverObjNavMenu = document.getElementById(this.id);
	if(hoverObjNavMenu != objNavMenu) {
		hoverObjNavMenu.style.color = linkHover;
		hoverObjNavMenu.style.backgroundColor = bgLinkHover;
	}
}

function menuOut(e){
	document.onclick = hideDropMenu;
	outObjNavMenu = document.getElementById(this.id);
	if(outObjNavMenu != objNavMenu) {
		outObjNavMenu.style.color = linkColor;
		outObjNavMenu.style.backgroundColor = bgLinkColor;
	}
}

function showDropMenu(e) {
	menuName = 'drop'+this.id.substring(3,this.id.length);
	objDropMenu = document.getElementById(menuName);
	if(prevObjDropMenu == objDropMenu){
		hideDropMenu();
	}
	if(prevObjDropMenu != null)
		hideDropMenu();
	objNavMenu = document.getElementById(this.id);
	if((prevObjNavMenu != objNavMenu) || (prevObjDropMenu == null)) {
		objNavMenu.style.color = linkActive;
		objNavMenu.style.backgroundColor = bgLinkActive;
	}
	if(objDropMenu) {
		xPos = objNavMenu.offsetParent.offsetLeft + objNavMenu.offsetLeft;
		yPos = objNavMenu.offsetParent.offsetTop + objNavMenu.offsetParent.offsetHeight;
		if(isIE){
			yPos -=1;
			xPos -=6;
		}
		objDropMenu.style.left = xPos + 'px';
		objDropMenu.style.top = yPos + 'px';
		objDropMenu.style.visibility = 'visible';
		prevObjDropMenu = objDropMenu;
		prevObjNavMenu = objNavMenu;
	}
}

function hideDropMenu(){
		document.onclick = null;
		if(prevObjDropMenu) {
			prevObjDropMenu.style.visibility = 'hidden';
			prevObjDropMenu = null;
			prevObjNavMenu.style.color = linkColor;
			prevObjNavMenu.style.backgroundColor = bgLinkColor;
		}
		objNavMenu = null;
}