how to fire a image button when user press enter key

[arpitwcc]

i am making u user login page where there are few buttons at the top of the page like Home, Services, About Us etc

and below it i hav
Username -- textbox
Password --textbox
Login --image button...


now after a user hav filled the password box and when he press the enter key then the 'Login' should fire..... but this button is not firing in my case....
the first button is fired i.e Home button is fired...

can u plz xplain....

note:-

i have added a OnclientClick= return validateuser() in the <asp:imgbutton> tag and in the <script> tag i have written the following code for checking if the username and password box are not left blank...like this.....

 
if(document.getElementById('<%= txtUsername.ClientID%>').value == "")
{
alert('Please enter username');
document.getElementById('<%= txtUsername.ClientID%>').focus();
return false;
}
 

[DrBunchman]

Moved to .NET Forum.

[DrBunchman]

So is the problem that when the user presses the enter key the wrong button is being 'clicked' ? If so then put your Username, Password and Login button controls in a panel and set the DefaultButton property of the panel to the ID of the image button.

Hope this helps,

Dr B