How to make Ubuntu ISO bootable on a USB stick with OSX?

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http://askubuntu.com – I have a Macbookpro and I'm planning to create a multiple boot. I've already created the necessary partitions and downloaded image file (i386) When I try to create a bootable USB stick from the ISO file, by means of "recovering" the disk image into the USB drive using Disk Image Utility, I get the following message: Could not validate source - corrupt image The disk image can't be mounted in OSX either, I also get a similar message. Is there any way to make a bootable Ubuntu USB stick from an ISO image in OSX? Thanks (HowTos)