Scroll problem

I made a dynamic text field (called theText) that loads in html.

I hooked it up with to self made buttons
and gave the buttons the following actionscript

on(press) {
theText.scroll += -1;

This works perfect but i want the scroller to work different.
Now i have to click to scroll i want to hold in the button to make it scroll.
Can someone help me with a tip.

Thanks in advance