How to add blinking cursor to this typewritter effect?

[font=Courier New]i used and method and this is how i did it:

I made a textbox and named it the variable: textbox

frame1:

q = 1;
text = "
OTSense [Beta Version 1.1]
<C> Copyright 2005";

frame 2:

if (q < text.length) {
textbox = text.substring(0, q);
q++
} else {
textbox = text;
gotoAndStop(2);
}

frame 3

gotoAndPlay(2);

i used a tutorial for this, judging by ur knoledge i beleive that u know
makes a new line for the text, i would somehow want a blinking underscore _ infront of each letter when displaying this effect, i wish u could help! [/font]