It looks like you're running CentOS5 or RHEL5, both of which should be supported by WHM.
Most all default kernels will have quota support. If you want to be sure, run the following:
# grep CONFIG_QUOTA /boot/config-2.6.18-128.4.1.el5
Also, it would appear the latest kernel is "2.6.18-194.26.1.el5".
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