function tab(i){
		selectTabMenuA(i);
	}
	function selectTabMenuA(i){
		switch(i){
			case 1:
			document.getElementById("java_img1").style.display="block";
			document.getElementById("java_img2").style.display="none";
			document.getElementById("java_img3").style.display="none";
			document.getElementById("java_img4").style.display="none";
			document.getElementById("java_img5").style.display="none";
			break;
			case 2:
			document.getElementById("java_img1").style.display="none";
			document.getElementById("java_img2").style.display="block";
			document.getElementById("java_img3").style.display="none";
			document.getElementById("java_img4").style.display="none";
			document.getElementById("java_img5").style.display="none";
			break;
			case 3:
			document.getElementById("java_img1").style.display="none";
			document.getElementById("java_img2").style.display="none";
			document.getElementById("java_img3").style.display="block";
			document.getElementById("java_img4").style.display="none";
			document.getElementById("java_img5").style.display="none";
			break;
			case 4:
			document.getElementById("java_img1").style.display="none";
			document.getElementById("java_img2").style.display="none";
			document.getElementById("java_img3").style.display="none";
			document.getElementById("java_img4").style.display="block";
			document.getElementById("java_img5").style.display="none";
			break;
			case 5:
			document.getElementById("java_img1").style.display="none";
			document.getElementById("java_img2").style.display="none";
			document.getElementById("java_img3").style.display="none";
			document.getElementById("java_img4").style.display="none";
			document.getElementById("java_img5").style.display="block";
			break;
		}
	}