Internet Explorer users must refresh after each submit

Microsoft Internet Explorer isn't recongizing the no cache flags that I put into this page. As a result, it uses the cached graphic from the last time the script was run. To see the new graphic, you must use your refresh button. This will rerun the script and reload the graphic. If anyone wants to look at my HTML code and tell me how to force MSIE to load the graphic the first time the script is run, I'll be grateful. Netscape seems to get the message...

Data Point Coordinates
Point IDxy
1.4142136.4142136
2-.4142136.4142136
3-.4142136-.4142136
4+.4142136-.4142136

Cell Vertex Coordinates
Vertex IDxy
101
200
310
4-10
50-1

Cell Edges
Data PointsVertices
1212
1423
2342
3452
1outside31
2outside14
3outside45
4outside53
Some error writing the image: Exception 420: no encode delegate for this image format `../html/jpeg/ws-graph.jpg' @ error/constitute.c/WriteImage/1180
graph of Wigner-Seitz division
Graph in separate window
coordinates:  
Text Above
Four points
19 points
Rotate input bydegrees
Line color for cell boundaries:   black   aqua   red   green   blue   none
Line color for neighbor links:  "; aqua   black   red   green   blue   none