function navigate (num) {
	var navto= "index.php?=1";
		switch(num) {
			case 1: navto = "index.php?"; break;
			case 2: navto = "main.php?p=2"; break;
			case 3: navto = "main.php?p=3"; break;
			case 4: navto = "main.php?p=4"; break;
		}
		document.location = navto;
	}