Changing CSS on the fly

Hi, is there a way to change a CSS Property inside a Rule definition
on the fly.

I have defined a rule

.myRule {
height: 22px;
width: 100px;
overflow: hidden
}

I have hundreds of DIV elements with that rule.
I will like to change the width property directly on the rule. Without
iterating all the elements and
inlining the new width.

Is that possible?

Thank you

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