You clicked somewhere within the polygon defined by the points:

148,86 177,63 217,67 252,111 229,127 194,125 148,86

The diagram is a rough drawing of RNA Polymerase scanning a DNA molecule. The polygon highlights the active site where RNA synthesis would occur.

The line in the imagemap file that defines what to do if you click within the polygon has the following syntax: 

poly http://zenith.berkeley.edu/~seidel/ClrHlpr/glob3.html 148,86 177,63 217,67 252,111 229,127 194,125 148,86

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