Yum - i386 packages on x86_64

[Tom Brown <tom@xxxxxxxx>]

Hi

I need to install some i386 packages onto my x86_64 machine and i wonder 
if i can do this with yum? I have configured yum so that it can see both 
repo's and i can list the contents of the i386 repo so i wonder where a 
package is present in both repo's how do i specify which to install.

i thought

yum install foo --arch=i386 might work but it does not - any ideas ?

thanks