Based on a sample of 1,558,479 web sites, the following table illustrates the penetration rate of a variety of client side technologies:

Technology	Sites	Percentage
JavaScript	1,066,435	68.43%
Frames	41,624	2.67%
StyleSheets	1,054,936	67.69%
Java	1,714	0.11%
IFrames	404,139	25.93%
GIF Images	772,300	49.55%
JPG Images	904,820	58.06%
PNG Images	756,154	48.52%
Flash/Shockwave	90,548	5.81%