layer question

im just learning layers and i have a question

lets say i have a layer and i want to add 25px to the left position so i write

document.all[‘layer’].style.left += “25”;

but javascript reads the left value as a string so it would say for example if the layer was a 100px, the layer is now equal to 100px25. so how do i make it recognize that the value is numeric.

thanks
alex

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