function checkEmail(e_mail) {
	var rejectedDomain=new Array()
	var index=0;
	//rejectedDomain[index++]="hotmail"
	//rejectedDomain[index++]="rocketmail"
	//rejectedDomain[index++]="yahoo"
	rejectedDomain[index++]="zdnetmail"

	var rejected=false
	var testresults=true
	var str=e_mail
	var filter=/^.+@.+\..{2,3}$/
	if (filter.test(str)){
		var tempstring = str.split("@")
		tempstring = tempstring[1].split(".")
		for (i=0; i<rejectedDomain.length; i++) {
			if (tempstring[0]==rejectedDomain[i])
			rejected=true
		}
		if (rejected) {
			var message="Please input a more official email address!\n"
			message += "The following addresses are not allowed:\n"
			for (i=0; i<rejectedDomain.length; i++) {
				message += "\t" + rejectedDomain[i] + "\n"
			}
			alert(message)
			testresults=false
		}
	} else {
		message="請輸入完整和正確的Email address！ ";
		alert(message)
		testresults=false
	}
	return (testresults)
}