function validEmail(email) {
		invalidChars = " /:,;"

		if (email == "") {
			return false
		}
		for (i=0; i<invalidChars.length; i++) {
			badChar = invalidChars.charAt(i)
			if (email.indexOf(badChar,0) > -1) {
				return false
			}
		}
		atPos = email.indexOf("@",1)
		if (atPos == -1) {
			return false
		}
		if (email.indexOf("@",atPos+1) > -1) {
			return false
		}
		periodPos = email.indexOf(".",atPos)
		if (periodPos == -1) {
			return false
		}
		if (periodPos+3 > email.length)	{
			return false
		}
		return true
	}

   function checkform(form)  {  	

		if (form.name.value=="")  {
		   alert("Please enter your name");
		   form.name.focus();
		   return false;
		}
		if (!validEmail(form.email.value))  {
		   alert("Please enter a valid email address");
		   form.email.focus();
		   return false;
		}
	    return true; 
	}