Hi @sandra208,
You need to replace the [https://www.ebay.com/itm/LCD-Glass-Screen-digitizer-display-replacement-for-SamSung-GALAXY-S-1ST-GT-I9000/281105414281|LCD screen]
The supplier in the link is only shown to give an idea of the cost of the part. There are other suppliers online that may suit you better. Just search for ''GT-i9000 LCD screen'' to get results
Here’s a link to the ifixit [guide|77415] guide which should be of some help.