var mainMenu = document.getElementById("mainMenu");
var mainMenuElements = mainMenu.getElementsByTagName("img");

var overview = document.getElementById("overview");
var general = document.getElementById("general");

var weekOverviewElement = document.getElementById("weekOverview");
var generalInformationsElement = document.getElementById("generalInformations");

for(var i = 0; i<mainMenuElements.length; i++){
	var menuElement = mainMenuElements[i];
	menuElement.onmouseover = function(){hideAll();}
}

weekOverviewElement.onmouseover = function(){showOverview();}
generalInformationsElement.onmouseover = function(){showGeneral();}

function hideAll(){
	overview.style.display = 'none';
	general.style.display = 'none';
}

function showGeneral(){
	hideAll();
	general.style.display = 'block';
}

function showOverview(){
	hideAll();	
	overview.style.display = 'block';
}// JavaScript Document