You can use
onkeydown
event to trap the event keycode and then press tab keycode.
Try something like this for the textbox:
<input type="text" onkeydown="EnterToTab()">
JS code:
function EnterToTab(){
if (event.keyCode==13)
event.keyCode=9;
}
PS: This is not suggestible as Enter and Tab have two different functions to perform and playing with them like this not good.