Scripted Atom-Highlight in VMD (See related posts)

# Highlight a certain selection. Selection is ONLY A STRING, not an atomselection
# Example:
# set repr "Licorice 0.300000 10.000000 30.000000"
# highlighting 0 $repr $id_KcsA "segid 1SG and resid 26 to 50 and not backbone"
# 
proc highlighting { colorId representation id selection } {
   set id [[atomselect $id $selection] molid]
   puts "highlighting $id"
   mol delrep 0 $id
   mol representation $representation
   mol color ColorID $colorId
   mol selection $selection
   mol addrep $id
}

set repr "Licorice 0.300000 10.000000 30.000000"
highlighting 0 $repr $id "segid 1SG and resid 26 to 50 and not backbone"