[Javascript] hi

[javascript@xxxxxxxxxx (javascript@xxxxxxxxxx)]

hi my name is adrian and i was wandering how to make a line 
break. Ill show you what i mean, this is what i wrote :
<script>
o=prompt('name please');

document.write("your name has " + o.length + " letters" );

z=prompt(' what are you making');

document.write( o + " is making " + z);
</script>
and i want to know how do i make the second thing to be 
written under the first not side by side, how can i do this line 
break. Thank you for your time Adrian