Using enter instead of tab (but with a button involved)

I have the following code to allow the use of the enter key instead of tab to move through the fields on my form

<script language="javascript">
document.onkeydown = KeyPress;
function KeyPress() {
if (event.keyCode == 13 && event.srcElement.type != 'textarea')
{
event.keyCode=9;
}
}
</script>

I need to also allow the enter key to be pressed when a button is involved, <input type=button ...>, but with the above code the enter is replaced with a tab.  What do I need to change.
LVL 3
jdthedjAsked:
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GaryCommented:
document.onkeydown = KeyPress;
function KeyPress(event) {
    elem = (event.srcElement ? event.srcElement : event.target);
    if (event.keyCode == 13 && elem.type != "button" && elem.type != 'textarea') {
        event.target.nextSibling.nextSibling.focus();
        event.preventDefault
    }
}

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jdthedjAuthor Commented:
Thanks for the reply Gary.  I cannot get the code to do anything.  I put in an alert at the start of the function and it fires, so it is getting to the code OK, but nothing happens.  I am using IE 11
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GaryCommented:
Code works fine
http://jsfiddle.net/9qxpvt0a/2/

Do you have a working link, this will depend on your markup
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jdthedjAuthor Commented:
I am working in our intranet so it is not outside.  Here is the whole code of the test page.

<FORM NAME="Test2" ACTION="Test2.htm" METHOD="Post">

<SCRIPT type="text/JavaScript">
<!-- hide
function ProcessForm(Nme)
{
if (Nme=="Get")
{
document.Test2.action="Test2.htm";
document.Test2.submit();
}
}
// stop hiding -->
</script>

<script language="javascript">
document.onkeydown = KeyPress;
function KeyPress(event) {
    elem = (event.srcElement ? event.srcElement : event.target);
    if (event.keyCode == 13 && elem.type != "button" && elem.type != 'textarea') {
        event.target.nextSibling.nextSibling.focus();
        event.preventDefault
    }
}
</script>

<DIV ID="Control1" STYLE="position:absolute; top: 40px; left: 100px; width: 100px; height: 22px;">
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 WIDTH=100%>
<TR VALIGN=top><TD><DIV align="Left">

<input type=text name="One" size=10><br>
<input type=text name="Two" size=10><br>
<input type=button value="Go" onClick="ProcessForm('Get')">

</DIV></TD></TR></TABLE></DIV>
</FORM>

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jdthedjAuthor Commented:
Thanks Gary - After more experimentation I have got it working with the following code

<script language="javascript">
document.onkeydown = KeyPress;
function KeyPress() {
var elem = (event.srcElement ? event.srcElement : event.target);
if (event.keyCode == 13 && event.srcElement.type != 'textarea' && elem.type != 'button')
{
event.keyCode=9;
}
}
</script>
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jdthedjAuthor Commented:
The line that provided the solution was

elem = (event.srcElement ? event.srcElement : event.target);
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GaryCommented:
Use this instead, doesn't rely on consecutive elements

http://jsfiddle.net/9qxpvt0a/6/

document.onkeydown = KeyPress;

function KeyPress(event) {
    elem = (event.srcElement ? event.srcElement : event.target);
    if (event.keyCode == 13 && elem.type != "button" && elem.type != 'textarea') {
        el = elem.nextSibling;
        while (el.type != "text" && el.type != "textarea" && el.type != "button") {
            el = el.nextSibling;
        }
        el.focus();
        event.preventDefault
    }
}

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jdthedjAuthor Commented:
Great! - thanks Gary
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