Image Opacity

[Jay Damon]

I inherited the following JavaScript method to set the opacity for images in IE. However, apparently if the image does not have an initial style similar to style="filter:alpha(opacity=100)", the code will not work as a result of the if statement on line 8. Is there a way to create an initial style in JavaScript if one does not exists?

function setOpacity(image, opacity)
{
var MIN_OPACITY = 0;
var MAX_OPACITY = 100;
 
if (image != null)
{
if (image.filters && image.filters.alpha)
{
if (opacity != null)
{
if (opacity >= MIN_OPACITY && opacity <= MAX_OPACITY)
{
image.filters.alpha.opacity = opacity;
}
}
else
{
opacity = parseInt(image.filters.alpha.opacity);
 
if (opacity < MAX_OPACITY)
{
image.filters.alpha.opacity = MAX_OPACITY;
}
else
{
image.filters.alpha.opacity = (MAX_OPACITY / 2);
}
}
}
}
}

[Jay Damon]

The JavaScript code is:

image.style.filter = "alpha(opacity=100)";