highlighter, i.e. yellow marker functionality

[Buchs, Kevin J.]

Wondering if anyone has written or can recommend a function 
(built-in/add-on) that would give the ability similar to a yellow 
marker, e.g. where MB1 down would set the background color of all text 
over which the pointer passes. Bonus points for not marking beginning of 
line and end of line white space, just like one would do with a real 
marker.  Thanks.

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Kevin Buchs   Research Computer Services   Phone: 507-538-5459
Mayo Clinic   200 1st. St SW   Rochester, MN 55905