function SwapImage1() {
  	document.image1.src="navs/games_on.jpg"
	}
	function SwapImage1Back() {
  	document.image1.src="navs/games.jpg"
	}

        function SwapImage2() {
  	document.image2.src="navs/prizes_on.jpg"
	}
	function SwapImage2Back() {
  	document.image2.src="navs/prizes.jpg"
	}

	function SwapImage3() {
  	document.image3.src="navs/menu_on.jpg"
	}
	function SwapImage3Back() {
  	document.image3.src="navs/menu.jpg"
	}

        function SwapImage4() {
  	document.image4.src="navs/concept_on.jpg"
	}
	function SwapImage4Back() {
  	document.image4.src="navs/concept.jpg"
	}