function switch_me(what) { 	
	for(var i=1; i<=10; i++) { 		
 		if (document.getElementById(i) || document.getElementById("a"+i)) {
			document.getElementById(i).style.display='none';
			document.getElementById("a"+i).className = "switch_off";
		}
	} 	
 	document.getElementById(what).style.display = 'block';
 	document.getElementById("a"+what).className = "switch_on";	
}