Form Validation Plugin Not Working...

Form Validation Plugin Not Working...

I try to validate a simple Form but the Jquery Validation Plugin not woking when I use only Button not The Submit Button.
I can not use the Submit button there Because If I use submit Button After Submitting the form It take the Action and goes to Default page while my current form is comes from Ajax. I am very new to Jquery. Please Help its Urgent...
I am giving the files here.
index.html
<html>
<head>
<script src="jquery.js">
<script="jquery-validate-min.js">
<script="validation.js>
</head>
<body>
<form id="contact_form">
<table>
<tr><th>Name</th><td><input name="name" /></td></tr>
<tr><th>E Mail</th><td><input name="email" /></td></tr>
<tr><th><input type="button" name ="submit" id="form_sub" onclick="save"></th><td><input name="email" /></td></tr>
</table>
</form>
</body>
</html>
 
Now the validation.js file
 
function save(){
 
$("#form_sub").click(function(){
$("# contact_form").validate({
'rules':{
'name':{
'required':true,
'minlength':5
},
'email':{
'required':true,
'email':true
}
}
})
}
 
 
 
Everything works fine when we use input type="submit"...
But it not working when we use input type="button"
 
Any Solution for that?
Please Help