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JavaScript User name Validation code

Source: Internet
Author: User
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<script language= "JavaScript" >
<!--
function Checkdata ()
{
if (! Checkisnull (Form1.oldpass, "Please enter your old password!") ")) return false;
if (! Checkisnull (Form1.newpass, "Please enter a new password!") ")) return false;
if (! Checkisnull (form1.confirm, "Please enter the confirmation password!") ")) return false;
if (Form1.newpass.value!=form1.confirm.value)
{
Alert ("New password and confirmation password are not the same!") ");
Form1.newpass.focus ()
return false;
}
}
-->
</SCRIPT>
<body bgcolor= "#e6f2ff" text= "#000000" leftmargin= "topmargin=" >
<br>
<br>
<br>
<table width= "458" border= "0" cellpadding= "0" cellspacing= "0" align= "center" class= "Kuan" >
<tr>
&LT;TD align= "left" valign= "Top" bgcolor= "#FFFFFF" >
<table width= "100%" border= "0" cellpadding= "0" cellspacing= "2" >
<tr>
&LT;TD background= "Images/system1.gif" height= "align=" "Center" ><font color= "#FF6633" class= "Font" ><b ><font color= "#FF9B59" > Please enter
&quot;<font color= "#FFFFFF" > Old password </font>&quot; and &quot;<font color= "#FFFFFF" > New password </font>&quot;
To modify the password </font></b></font></td>
</tr>
<tr>
&LT;TD bgcolor= "#FFFFFF" class= "Linkfont" align= "center" valign= "Middle" >
<form name= "Form1" method= "Post" action= "admin/savepass.asp" onsubmit= "return Checkdata ()" >
<br>
<table width= "257" border= "0" cellpadding= "0" cellspacing= "0" >
<tr>
&LT;TD width= "33%" class= "Font" align= "right" valign= "middle" height= "a" > Old password:</td>
&LT;TD width= "67%" align= "left" valign= "middle" height= ">"
<input type= "Password" name= "Oldpass" "size=" class= "TextInput" >
</td>
</tr>
<tr>
&LT;TD width= "33%" class= "Font" align= "right" valign= "middle" height= "a" > New password:</td>
&LT;TD width= "67%" align= "left" valign= "middle" height= ">"
<input type= "Password" name= "Newpass" "size=" class= "TextInput" >
</td>
</tr>
<tr>
&LT;TD width= "33%" class= "Font" align= "right" valign= "middle" > Confirm password:</td>
&LT;TD width= "67%" align= "left" valign= "Middle" >
<input type= "Password" name= "confirm" "size=" class= "TextInput" >
</td>
</tr>
&LT;TR align= "center" valign= "Middle" >
&LT;TD colspan= "2" height= "> <br>"
<input type= "Submit" name= "Submit" value= "Modify" class= "Textbotton" >
<input type= "reset" name= "Submit2" value= "reset" class= "Textbotton" >
</td>
</tr>
</table>
</form>

</td>
</tr>
</table>
</td>
</tr>
</table>

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