convert password field before form.submit

[Stroker]

I have a password field that I want to convert to a more secure string before POST submit.
I tried some code that you can se below. The problem I have with this code is that i end up with two FORM NAME "password" and "password". One is generated from Ext.lib.Ajax.formRequest and the other generated from Action.getParams(). Do anyone know how I can make this work?

 myForm.on('beforeaction', function(form, action) { 
    	var passwordValue = form.items.item(1).getValue(); 
    	form.baseParams = {}; 
    	form.baseParams['password'] = hex_md5(passwordValue + key); 
    });

[haibijon]

This should work, I'm currently doing something almosy identical.

			myForm.on('beforeaction', function(form, action) {
			        var item = form.items.item(1);
			    	item.setRawValue( hex_md5( item.getValue() + key ) );
			});