function trim(str) {
res="";
for(var i=0; i< str.length; i++) {
if (str.charAt(i) != " " && str.charAt(i) != "　") {
res +=str.charAt(i);
}
}
return res;
}//trim()

function Check_num() {
	if (event.keyCode < 48 || event.keyCode > 57) event.returnValue = false;
}

/*檢查是否為Email格式*/
function chkemail(objName) {
	var obj = objName;
	var c = obj.value.charAt(0);
	if (!((c>="a" && c<="z") || (c>="0" && c<="9") || (c>="A" && c<="Z"))) {
		alert("Email format is incorrect, please review your entry!");
		obj.focus();
		return(false);
	}
	var c = obj.value.charAt(obj.value.length-1);
	if (!((c>="a" && c<="z") || (c>="0" && c<="9") || (c>="A" && c<="Z"))) {
		alert("Email format is incorrect, please review your entry!");
		obj.focus();
		return(false);
	}
	if ((obj.value.indexOf("@")=="-1") || (obj.value.indexOf(".")=="-1")) {
		alert("Email format is incorrect, please review your entry!");
		obj.focus();
		return(false);
	} 
	return(true);
}