Clear input fields onfocus - input

Question

I'm having problems creating a couple functions to clear an input field onfocus and reset it back to the default text onblur if it's empty. It works fine until you change some of the text and then backspace it out.
My functions are:
function enterField (id, defaultText) {
if (document.getElementById(id).value == defaultText) {
document.getElementById(id).setAttribute("value", "");
document.getElementById(id).style.color = "#000000";
}
}
function leaveField (id, defaultText) {
if (document.getElementById(id).value == "" || document.getElementById(id).value == defaultText) {
document.getElementById(id).setAttribute("value", defaultText);
document.getElementById(id).style.color = "#dddddd";
}
}
And my html is:
<table style="width: 464px; margin-right: -7px; margin-left: -7px; table-layout: fixed;" cellpadding="0" cellspacing="8">
<tr>
<td class="input"><input id="name" type="text" class="name" size="32" value="Name" onfocus="enterField('name', 'Name');" onblur="leaveField('name', 'Name');"></td>
<td class="input"><input id="email" type="text" class="name" size="32" value="Email" onfocus="enterField('email', 'Email');" onblur="leaveField('email', 'Email');"></td>
</tr>
<tr>
<td class="input" colspan="2"><textarea id="message" class="message" rows="8" onfocus="enterField('message', 'Message');" onblur="leaveField('message', 'Message');">Message</textarea></td>
</tr>
<tr>
<td style="text-align: right;" colspan="2"><input id="submit" type="submit" class="button" value="Send"></td>
</tr>
</table>
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Answer 1

change
document.getElementById(id).setAttribute("value", defaultText);
to
document.getElementById(id).value = defaultText;
at both occurrences in your functions.