function ComSwitch(id)
{
	if(document.getElementById("ComContent"+id).style.display == "none"){
		for (i = 1; i <= 3; i++){
			if(i == id){
				document.getElementById("ComContent"+i).style.display = "block";
				document.getElementById("ComImg"+i).style.visibility = "visible";
			}else{
				document.getElementById("ComContent"+i).style.display = "none";
				document.getElementById("ComImg"+i).style.visibility = "hidden";
			}
		}
	}
}