//drop down code

function navImageChange(imageLink,imageID) {
	var imageIDVar = document.getElementById(imageID);
	imageIDVar.src="_images/" + imageLink;
		
}



function menuOpen(menuID) {
   var menu = document.getElementById(menuID);
   menu.style.visibility="visible";
}
function menuClose(menuID) {
   var menu = document.getElementById(menuID);
   menu.style.visibility="hidden";
}

function changeButtonBkg(buttonID,buttonBkgImage,buttonColor) {
	var button = document.getElementById(buttonID);
	var buttonBkg = "url(_images/" + buttonBkgImage + ")";
	button.style.backgroundImage=buttonBkg;
	button.style.color=buttonColor;
}