function showHide(targetID) {
	var cal = 3;
	var i = 1;

	if(document.getElementById){
		if(document.getElementById(targetID).style.display == "block"){
			document.getElementById(targetID).style.display = "none";
		}else{
			for(i = 1; i <= cal; i++){
				document.getElementById("cal"+i).style.display = "none";
			}
			document.getElementById(targetID).style.display = "block";
		}
	}
}