How do I populate variable with NULL in link

I need to reset a variable value to null upon clicking on a link on the page. I have gone into the field and setup the link, selected the field, and set value to NULL, then told it to create the link.
When it gets to the new page I get an error of Invalid Number on the queries using the variable. I have an NVL in the query which works. How can I set the variable to NULL instead of the string value "NULL"

"216080",
I understand no more than the gist of your description, and nothing at all of the second sentence. But let me offer this in case it might help. To set an item value to null in a link, you can use a comma to represent the null value, for example f?p=100:1:&SESSION.::::P1_ITEM,P2_ITEM,P3_ITEM:999,,888 will set P1_ITEM to 999, P2_ITEM to null, and P3_ITEM to 888. This may not be exactly what you asked for ("to reset a variable value to null upon clicking on a link to the page") but it will set the various items' values in session state as I described at the time the page request is processed. Nothing will happen on the current page when you click the link.
57434
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