Instead of a for loop, try something like this:

inc=0; ltimer=timer+15;
while(inc<strlen(phrase))
{
rectfill(0,0,screenx-1,screeny-1,black);
gotoxy(20,420);
printstring(big,left(phrase,inc+1));
updatecontrols();
showpage();
if(timerltimer) { inc++; ltimer=timer+7+random(8); }
}

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-Pontifex
"How many rocks are there, in the whole world?"

Just use setcliprect to clip the text for you!
This could be adapted to use a word-wrapper if you wanted, by the way.

string stext_line[3]; // I like arrays. ^_^

void SText(string s1,string s2,string s3)
{
int curline,curchar;
int x,y; // position that the box is displayed
int i,j; // loop counters

stext_line[0]=s1; stext_line[1]=s2; stext_line[2]=s3; // a little hacky, I know
x=0; y=0; // you could pass these as parameters, if you wanted

for (curline=0; curline<3; curline++)
{
for (curchar=0; curchar<strlen(stext_line[curline]); curchar++) // loop through every char in the string
{
Render();
DrawBox(x,y,x+screenx,y+(screeny/3)); // change this as necessary

for (i=0; i<curline; i++) // draw any lines that we've already written out
{
gotoxy(x,y+(fontheight(0)*i)); // go to wherever this line should be written
printstring(0,stext_line[i]);
}
gotoxy(x,y+(fontheight(0)*curline)); // draw this line (however much of it we must draw)
setcliprect(x,y,x+(fontwidth(0)*curchar),screeny); // we'll be cheap, since it's only writing one line anyway. ^_~
printstring(0,stext_line[curline]); // voila!

showpage();
updatecontrols();
delay(1);
}
}
}

This is all untested, by the way, so good luck!

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'Never confuse a single defeat with a final defeat.' -F. Scott Fitzgerald