Form Validation in VBScript

Name:
Email:
Phone: 
<HEAD>

<SCRIPT LANGUAGE="VBSCRIPT">
<!--
	Sub Button1_onclick
		If Form1.elements(0).value <> "" Then
			If Form1.elements(1).value <> "" Then 
				If Form1.elements(2).value <> "" Then
					' OK, all of the fields have some value entered.
					' Now check email address for '@' and '.' characters
					If InStr(Form1.elements(1).value, "@") <> 0 Then
						If InStr(Form1.elements(1).value, ".") <> 0 Then
							Form1.Submit
						Else	
							alert "Your email address must contain a '.' character."
						End If
					Else
						alert "Your email address must contain a '@' character."
					End If
				Else
					alert "Please fill out the 'Phone' field"
					Form1.elements(2).focus
				End IF
			Else
				alert "Please fill out the 'Email' field"
				Form1.elements(1).focus
			End If
		Else
			alert "Please fill out the 'Name' field"
			Form1.elements(0).focus
		End If
	End Sub
-->
</SCRIPT>

</HEAD>

<BODY>

<FORM NAME="Form1" ACTION="08_submit2.htm">
	<TABLE WIDTH=500 CELLPADDING=0 CELLSPACING=3 COLS=2 BORDER=0>
		<TR>
			<TD ALIGN=RIGHT VALIGN=TOP WIDTH=50>
				<FONT FACE="Verdana, Arial, Helvetica" SIZE=2>
				Name:
				</FONT>
			</TD>
			<TD ALIGN=LEFT VALIGN=TOP WIDTH=450>
				<INPUT TYPE=TEXT SIZE=40 NAME="txtName">
			</TD>
		</TR>
		<TR>
			<TD ALIGN=RIGHT VALIGN=TOP>
				<FONT FACE="Verdana, Arial, Helvetica" SIZE=2>
				Email:
				</FONT>
			</TD>
			<TD ALIGN=LEFT VALIGN=TOP>
				<INPUT TYPE=TEXT SIZE=40 NAME="txtEmail">
			</TD>
		</TR>
		<TR>
			<TD ALIGN=RIGHT VALIGN=TOP>
				<FONT FACE="Verdana, Arial, Helvetica" SIZE=2>
				Phone:
				</FONT>
			</TD>
			<TD ALIGN=LEFT VALIGN=TOP>
				<INPUT TYPE=TEXT SIZE=40 NAME="txtPhone">
			</TD>
		</TR>
		<TR>
			<TD ALIGN=LEFT VALIGN=TOP WIDTH=100% COLSPAN=2>
				<INPUT TYPE=BUTTON VALUE="Submit" NAME="Button1">
			</TD>
		</TABLE>
	</TABLE>
</FORM>