Creating Gradients in IE 5.5
The Gradient Filter allows for color gradients to be rendered on the client side, at the resolution of the display, without the need to author images that contain a pre-determined gradient at a fixed resolution. The gradients can also contain transparency values as part of the color definition, enabling content authors to create interesting visual effects. The color values that define the gradient can be accessed and dynamically changed through the properties exposed by the filter.
Horizontal Gradient with Transparency
Adding FF for to the startColorstr and 00 to the endColorstr adds a transparent gradient.
Vertical Gradient with Transparency
This is the the same as the above gradient, however the gradientType attribute is set to 0.
Gradient with Transparency animated with HTML+TIME
Both the transparency attributes and the color attributes can be animated.