BeeDeeDubbleU - 10:19 pm on Apr 21, 2008 (gmt 0)

I am not sure that I am interpreting your requirements properly but here goes.

You can use find and replace to locate the tags but assuming that the words you want to replace are different on each alt tag you would still need to change them individually.

To do this choose Edit > Find and Replace then when the Find and Replace window opens select the "Find in Entire Local Site" site option along with the "Search Source Code" option.

Put alt= in the Find box and keep clicking "find next" to find all occurrences of alt=.

Edit: posted at same time as reply above.

[edited by: BeeDeeDubbleU at 10:20 pm (utc) on April 21, 2008]