Setting Styles with JavaScript

function setStyle(objId, style, value){
   document.getElementById(objId).style[style]= value;
}
/* USAGE:
 * objId    = element id.
 * style    = the style to be changed.
 * value    = the value assigned to the style.
*/



function getStyle(el, style) {
   if(!document.getElementById) return;
  
     var value = el.style[toCamelCase(style)];
  
    if(!value)
        if(document.defaultView)
            value = document.defaultView.
                 getComputedStyle(el, "").getPropertyValue(style);
      
        else if(el.currentStyle)
            value = el.currentStyle[toCamelCase(style)];
    
     return value;
}

/** toCamelCase(input)
 * Converts string input to a camel cased version of itself.
 * For example:
 * toCamelCase("z-index"); // returns zIndex
 * toCamelCase("border-bottom-style"); // returns borderBottomStyle.
 */
function toCamelCase(s) {
    for(var exp = toCamelCase.exp;
        exp.test(s); s = s.replace(exp, RegExp.$1.toUpperCase()) );
    return s;
}
toCamelCase.exp = /-([a-z])/;