[jQuery] jQuery Validate using input type=image

I am validating a form that is submitted by an image input (input
type=image), there are 3 of these inputs which either publish, save or
delete the form details. If I turn javascript off and submit the form
I can pick up the value of the input button used. i.e. request.form
("publish.x") = ?, if I turn javascript on and use the jQuery validate
plugin it does everything excpet pass the value of the button pressed
so I can't detect which button has been pressed. Any help appreciated.

[code]
$(function() {
$("#vml_library").validate({
ignore: "input[type=hidden]",
rules: {
mName: {
required: true
},
mSummary: {
maxlength: 200
},
mDescription: {
required: true
},
mFile: {
required: true,
accept: ""+$("input[name=typeList]").val().replace(/\'/g,
'').replace(/\./g, '').replace(/,/g, '|') +""
},
tFile: {
required: function(element) {
return $("input[name=vType]").val() > 1;
},
accept: true
}
},
messages: {
mName: {
required: "Required"
},
mFile: {
required: "Required",
accept: "Invalid File, must be " + $("input[name=typeList]").val()
},
mSummary: {
maxlength: "You may not use anymore than 200 characters"
},
mDescription: {
required: "Required"
},
tFile: {
required: "Required",
accept: "Invalid File, must be '.jpg', '.jpeg', '.gif' or '.png'"
}
},
success: function(label) {
label.addClass("valid").text("OK!");
},
highlight: function(element, errorClass) {
$(element).addClass("errorInput");
},
unhighlight: function(element, errorClass) {
$(element).removeClass("errorInput");
},
submitHandler: function(form) {
ShowProgress();
form.submit();
}
});

});
[/code]