Finding vertical loc of last word of text in a field

[Mark Swindell]

This should be simple, but how do I determine the vertical location  
of the last word of  text in a field?  Essentially I want to "click  
at last word of field myText" and  "put the clickLoc into myVar".

What I want to do is have a vertical slider dynamically match the  
height of text in a field next to it.  The field is a fixed height,  
but the text that goes into it isn't.

Thanks,
Mark