Don't worry about the rims, just change the tires out. Go to a 26" High Pressure slick like the Kenda Quest, or any of the others. The rims you have will accept a 26X1.5 slick with extreme ease. Tires are interchangable within a certain range.
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. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant