// --- Flip Layers

function show(id) {

	document.getElementById(id).style.visibility = "visible";

	document.getElementById(id).style.display = "block";

}

function hide(id) {

	document.getElementById(id).style.visibility = "hidden";

	document.getElementById(id).style.display = "none";

}



// --- Only accept digits (numbers)

function onlyNumbers(e,o){

	//alert(o.value);

	var keynum

	var keychar

	var ltrcheck

	var crcheck

	if(window.event){ // IE

		keynum = e.keyCode

	}else if(e.which){ // Netscape/Firefox/Opera/Safari/Others

		keynum = e.which

	}

//alert(keynum);

	if (keynum == 08 || keynum == 46 || keynum == 13 || !keynum) return true; // Backspace, decimal point, enter, or navigation (arrow) key

	keychar = String.fromCharCode(keynum)

//alert(keychar);

	ltrcheck = /\D/ //Regular expression for NON-digit (letter)

	crcheck = /\cM/ //Regular expression ctrl-M (enter)

	if (crcheck.test(keychar)) o.blur();

	return !ltrcheck.test(keychar) //Return true if not a letter

//	return (!ltrcheck.test(keychar)||crcheck.test(keychar)) //Return true if not a letter OR enter

}