function checkMenu(itemNum) {
	
	if (itemNum == 1){
		var myStyle = document.getElementById('submenu-active').style;
		 myStyle.background='url(../site-resources/images/whatIdo/link1_active.gif) top left no-repeat';
		 
	} else if (itemNum == 2){
		var myStyle = document.getElementById('submenu-active').style;
		 myStyle.background='url(../site-resources/images/whatIdo/link2_active.gif) top left no-repeat';
		 
	} else if (itemNum == 3){
		var myStyle = document.getElementById('submenu-active').style;
		 myStyle.background='url(../site-resources/images/whatIdo/link3_active.gif) top left no-repeat';
		 
	}
	
}