How do I read stylesheet information in Javascript?
You can read the style sheets:
Mozilla browsers (Netscape 6.0+)
document.styleSheets[index].cssRules[index].style.backgroundColor
Internet Explorer 4
document.styleSheets[index].rules[index].style.backgroundColor
Internet Explorer 5 and above
element.currentStyle.backgroundColor
Netscape Navigator 4
window.getComputedStyle(element, '').getPropertyValue('background-color')