How to highlight the searched words ?

Hello there
I wrote one program in VC++ to highlight all words found in page
currently navigated in browser. For that I am just appending
"<span id=\"HTMLSEARCH\" STYLE=\"background-color: Highlight
COLOR:HighlightText\"\\>" it to words found so as to highlight the
words. My problem is that if the background color is same as
highlighted color them you can't read the word. I want to highlight
the word just like when you select any word using mouse. It highlights
the word and sets the background color which is exact reverse to
previous background color. How can I do this ?
Should I chage the background-color and color ?