Phone Number Input Help

Greetings... I am setting up a text box to accept a phone number with an input mask of 000-000-0000;0;_ but it isnt doing quite what I want it to do, I would like it to start at the begining when clicked to prevent the error of a user typing in the number a space too far to the right. (right now it places the cursor where ever the user clicks, which becomes a major pain when you want to just be able to click the field anywhere and type from left to right for sake of speed)

thanks for any solutions you might have to offer