Print

I have a prob in printing in netscape.
I am using Window.print(). I have put an Image on screen on clicking which the page has to be printed. Since i dont want the Image to be printed out in the output I make the image to blank (using document.Images["imagename"].src) before pushing the page to print and I replace it back after printing.
This works fine in IE5 but not in netscape. Once the image is made blank the code below it is not atall executed in netscape. Has anybody come across this or can anybody throw some ideas on this.

Thanks