I'm trying to create fields that are automatically formated to the number format but allow a suffix for the unit of measure. The form is filled out on the iPad and its most helpful that the number format automatically opens to the numberpad for data

I'm trying to create fields that are automatically formated to the number format but allow a suffix for the unit of measure.  The form is filled out on the iPad and its most helpful that the number format automatically opens to the numberpad for data entry.  But I'm using a validation script that won't allow for a number format.  Is there a javascript that can do both?  This is what I have so far...   event.value = event.value + "mm";

I keep thinking that maybe there is a way to add additional currency symbols that would include measurement suffixes.  Any help is appreciated.