Handling HTML-reserved characters in passed item values

I've got a pair of pages in an application where one gets an item value from an inline value of a report on the other page. Since the link I created is conditional, I used the concatenate html string method to create the link. However, some of the values that are getting passed contain "+" as part of the value. How can I get this value to pass via the concated HTML string?
Here's the SQL I'm using:
SELECT x.*
,decode(x.source,'S','<a href ="f?p=&APP_ID.:403:&SESSION.::&DEBUG.:RP:P403_PAGE_LOAD,P403_LOT_NO,P403_ATTRIBUTE:1,'||x.lot_no||',\'||to_char(x.attribute)||'\">S</a>','P') as icon
FROM x
where x.attribute sometimes contains the "+" character.
Any help would be appreciated!

Thank you both for replies ....
Since these urls are generated through code, what is the best way to go about it ?
Could you please explain a little about using of hash map in this case?
and excpet using escape characters, is there any other way to do it ?
Thanks again

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