[fw-mvc] Dojo IE issues

If a dojo form has different submit buttons like (Save, Delete etc.) I
think it's a good practice to submit it to the same action and then
redirect to an appropriate action based on the clicked button check.
Some PHP frameworks with Dojo support have built-in methods for such
checks like Zend_Dojo_Form_Element_Button::isChecked() for instance.

Although this approach works under Firefox it fails under IE because
of the following differences in the submitted POST data:

POST:

Dojo 1.2.3:

Firefox 3:

array(5) {
…
["button1"] => string(6) "value1"
}

IE6:

array(5) {
…
["button1"]=> string(6) "value1"
["button2"]=> string(10) "value2"
}

Even though only button1 was clicked!

Dojo 1.3.1:

Firefox 3:

array(5) {
…
["button1"] => string(6) "value1"
}

IE7:

array(5) {
…
["button1"] => string(304) "<SPAN class="dijitReset dijitInline"
dojoAttachPoint="iconNode" unselectable="on"><SPAN class="dijitReset
dijitToggleButtonIconChar" unselectable="on">✓</SPAN></SPAN><SPAN
class="dijitReset dijitInline dijitButtonText" id= button1_label
dojoAttachPoint="containerNode" unselectable="on">Search</SPAN>"
}

Does anybody know a workaround for it? Many thanks in advance.