Get style property of DOM element using JavaScript

gistfile1.js

/**
 * Returns styleProperty of given element
 */
function getStyle(el, styleProperty)
{
    if (el.currentStyle) 
        return el.currentStyle[styleProperty];
    else if (window.getComputedStyle)
        return document.defaultView.getComputedStyle(el,null).getPropertyValue(styleProperty);
}