Random move in one direction

minDist = 5;
maxDist = 50;
minHold = 5; // frames
maxHold = 15;
seedRandom(index,true);

t0 = 0;
t1 = 0;
yTot = 0;

while (t1 < time){
t0 = t1;
t1 += random(framesToTime(minHold),framesToTime(maxHold));
if (t1 < time)
yTot += random(minDist,maxDist);
}
value - [0,yTot]