onKeyDown not working with Firefox

[Ben Star]

Ohhh Firefox.... I have created a javascript that when you click in a box to update a value, the submit button grays out and the update buttons is active. This works fine in IE and Safari as well as if i call the javascript from a drop down menu onChange it works fine, just when i do a onKeyPress or onKeyDown. I have been doing research on this all morning and getting tired of it. The closest thing i found was doing something like this, but i can not figure out how to get it to work with my script.

function EnterKey(e)
{
     var key;
     if(window.event)
          key = window.event.keyCode;     //IE
     else
          key = e.which;     //firefox
           
     if(key == 13)
          return true;
     else
          return false;
}

Here is my input...

<input size="2" tabindex="2" onkeydown="validate();" onblur="setFocus()"  type="text" maxlength="3" name="qty<?php echo $prod_key; ?>" value="<?php echo $qty; ?>"/>

Here is my javascript to gray out the submit button and show the update button.

function validate( the_form ) {  

	var x=document.getElementById('update');
	var y=document.getElementById('sale_pass');	
	var z=document.getElementById('reason');
	var hide=document.getElementById('hide');
	var hide_r=document.getElementById('hide_r');
	var sale=document.getElementById('sale_type');
	var car=document.getElementById('complete');
	
	car.disabled = true;
	x.style.visibility = 'visible';
	if(sale.value != 'sale') {
	    y.style.visibility = 'hidden';
		z.style.visibility = 'hidden';
		hide.style.visibility = 'hidden';
		hide_r.style.visibility = 'hidden';
	}
	//x.focus();
}
</script>

[Dormilich]

probably something like

// input is your input element
input.onkeydown = EnterKey;

// somewhere inside EnterKey() you have to call validate()