Rounding a number UP

I know math.round would round a number.

but what if i wanted to round it just up.

so lets say I have 8 thumbnails, my rows are 4 thumbnails long.

so 8/4 = 2 rows.

if I have 1 thumbnail, 1/4 = 0.25 rows. I want this to round up to 1 row.

var myNumber:Number = 1/4

Math.ceil(myNumber)

boohya thanks