var plImgs = new Array();
function pl(){
	for (var i=0;i<arguments.length;i++){
		plImgs[plImgs.length] = new Image();
		plImgs[plImgs.length-1].src = arguments[i];
	}
}

//nav images
pl("images/enter_off.gif")
//pl("images/contact_off.gif")
//pl("images/legal_off.gif")
//pl("images/copyright_off.gif")
//sub nav text
pl("images/venice_off.gif")
pl("images/kefilonia_off.gif")
pl("images/rotterdam_off.gif")

function cp(img, src){ //flat change pic function (no ns lyr rb/rl)
	document.images[img].src = src;
}

var onoffstrs = new Array('_off.', '_on.')
function rollOn(img){
	if (typeof document.images[img] == "undefined") return;
	
	var newsrc = document.images[img].src.replace(onoffstrs[0], onoffstrs[1])
	cp(img, newsrc)
}
function rollOff(img){
	if (typeof document.images[img] == "undefined") return;
	
	var newsrc = document.images[img].src.replace(onoffstrs[1], onoffstrs[0])
	cp(img, newsrc)
}