var curMenu = 0;

function showMenu(menu) {
	
	if(menu == 1) {
		MM_swapImage('about','','images/aboutb.gif',1);
		MM_swapImage('meds','','images/asthmameda.gif',1);
		MM_swapImage('beatback','','images/beatbacka.gif',1);
		MM_swapImage('techniq','','images/techniqa.gif',1);
		
		menuHide = document.getElementById("menu2");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu3");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu4");
		menuHide.style.visibility = "hidden";
		curMenu = 1;
	}
	
	if(menu == 2) {
		MM_swapImage('about','','images/abouta.gif',1);
		MM_swapImage('meds','','images/asthmamedb.gif',1);
		MM_swapImage('beatback','','images/beatbacka.gif',1);
		MM_swapImage('techniq','','images/techniqa.gif',1);
		
		menuHide = document.getElementById("menu1");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu3");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu4");
		menuHide.style.visibility = "hidden";
		curMenu = 2;
	}
	
	if(menu == 3) {
		MM_swapImage('about','','images/abouta.gif',1);
		MM_swapImage('meds','','images/asthmameda.gif',1);
		MM_swapImage('beatback','','images/beatbackb.gif',1);
		MM_swapImage('techniq','','images/techniqa.gif',1);
		
		menuHide = document.getElementById("menu1");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu2");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu4");
		menuHide.style.visibility = "hidden";
		curMenu = 3;
	}
	
	if(menu == 4) {
		MM_swapImage('about','','images/abouta.gif',1);
		MM_swapImage('meds','','images/asthmameda.gif',1);
		MM_swapImage('beatback','','images/beatbacka.gif',1);
		MM_swapImage('techniq','','images/techniqb.gif',1);
		
		menuHide = document.getElementById("menu1");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu2");
		menuHide.style.visibility = "hidden";
		menuHide = document.getElementById("menu3");
		menuHide.style.visibility = "hidden";
		curMenu = 4;
	}
	
	menuDiv = document.getElementById("menu" + menu);
	menupos = document.getElementById("menuImg");
	
	if(is_nav || is_opera) {
		menuDiv.style.left = findPosX(menupos) + 11 + "px";
		menuDiv.style.top = findPosY(menupos) + 7 + "px";
	}
	if(is_ie) {
		menuDiv.style.left = findPosX(menupos) + 22;
		menuDiv.style.top =  findPosY(menupos) + 22;
	}
	
	menuDiv.style.visibility = "visible";

}

function hideMenu(menu) {
	
	//menuDiv = document.getElementById("menu" + menu);
	//menuDiv.style.visibility = "hidden";

}

// Positioning functions
function reposition() {
	menuDiv = document.getElementById("menu" + curMenu);
	menupos = document.getElementById("menuImg");
	
	if(is_nav) {
		menuDiv.style.left = findPosX(menupos) + 11 + "px";
		menuDiv.style.top = findPosY(menupos) + 7 + "px";
	}
	if(is_ie) {
		menuDiv.style.left = findPosX(menupos) + 22;
		menuDiv.style.top =  findPosY(menupos) + 22;
	}
}

function findPosX(obj)
{
	var curleft = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	return curleft;
}

function findPosY(obj)
{
	var curtop = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (obj.y)
		curtop += obj.y;
	return curtop;
}