function codep() {
	var cp = document.forms["cdp"].elements["cp"].value ;
	var chkZ = 1;
	for(i=0;i<document.forms["cdp"].elements["cp"].value.length;++i)
		if(document.forms["cdp"].elements["cp"].value.charAt(i) < "0" || document.forms["cdp"].elements["cp"].value.charAt(i) > "9")
			chkZ = -1;
	if(i!=5 || chkZ == -1) {
		document.forms["cdp"].elements["cp"].style.color = "#CC3333";
		return false;
	}
}