// ----------------------------------------------------------------------------
// HasClassName
//
// Description : returns boolean indicating whether the object has the class name
//    built with the understanding that there may be multiple classes
//
// Arguments:
//    objElement              - element to manipulate
//    strClass                - class name to add
//
function HasClassName(objElement, strClass) {
	// if there is a class
	if ( objElement.className ) {
		// the classes are just a space separated list, so first get the list
 		var arrList = objElement.className.split(' ');

        // get uppercase class for comparison purposes
        var strClassUpper = strClass.toUpperCase();
  
        // find all instances and remove them
        for ( var i = 0; i < arrList.length; i++ ){
           // if class found
           if ( arrList[i].toUpperCase() == strClassUpper ) {  
              // we found it
              return true;  
           }
        } 
     }  
    // if we got here then the class name is not there
    return false;
}

// ----------------------------------------------------------------------------
// AddClassName
//
// Description : adds a class to the class attribute of a DOM element
//    built with the understanding that there may be multiple classes
//
// Arguments:
//    objElement              - element to manipulate
//    strClass                - class name to add
//
function AddClassName(objElement, strClass, blnMayAlreadyExist) {
	// if there is a class
    if ( objElement.className ) {
    	// the classes are just a space separated list, so first get the list
        var arrList = objElement.className.split(' ');
  
        // if the new class name may already exist in list
        if ( blnMayAlreadyExist ){
           // get uppercase class for comparison purposes
           var strClassUpper = strClass.toUpperCase();

           // find all instances and remove them
           for ( var i = 0; i < arrList.length; i++ ){
              // if class found
              if ( arrList[i].toUpperCase() == strClassUpper ){
                 // remove array item
                 arrList.splice(i, 1);
  
                 // decrement loop counter as we have adjusted the array's contents
                 i--; 
              }
           }
        } 
		// add the new class to end of list
        arrList[arrList.length] = strClass;
  
        // add the new class to beginning of list
        //arrList.splice(0, 0, strClass);
        
	    // assign modified class name attribute
        objElement.className = arrList.join(' ');  
     } 
     // if there was no class
     else {
        // assign modified class name attribute      
        objElement.className = strClass;     
     }
}

// ----------------------------------------------------------------------------
// RemoveClassName
//
// Description : removes a class from the class attribute of a DOM element
//    built with the understanding that there may be multiple classes
//
// Arguments:
//    objElement              - element to manipulate
//    strClass                - class name to remove
//
function RemoveClassName(objElement, strClass){
	// if there is a class
    if ( objElement.className ){
       // the classes are just a space separated list, so first get the list
       var arrList = objElement.className.split(' ');
  
       // get uppercase class for comparison purposes
       var strClassUpper = strClass.toUpperCase();
  
       // find all instances and remove them
       for ( var i = 0; i < arrList.length; i++ ){
          // if class found
          if ( arrList[i].toUpperCase() == strClassUpper ) {
             // remove array item
             arrList.splice(i, 1);
  
             // decrement loop counter as we have adjusted the array's contents
             i--;  
          }
		}
		// assign modified class name attribute
		objElement.className = arrList.join(' ');
	}
    // if there was no class, there is nothing to remove
}

function getElementsByClassName(needle) {
   	var s, i, r = [], l = 0, e;
    var re = new RegExp('(^|\\s)' + needle + '(\\s|$)');

   	if (navigator.userAgent.indexOf('Opera') > -1) {
       	s = [document.documentElement || document.body], i = 0;
        do  {
            e = s[i];
            while (e) {
                if (e.nodeType == 1) {
                   	if (e.className && re.test(e.className)) 
                   		r[l++] = e;
                  	s[i++] = e.firstChild;
               	}
               	e = e.nextSibling;
           	}
       	}
       	while (i--);
   	} else {
        s = document.getElementsByTagName('*'), i = s.length;
        while (i--) {
   	        e = s[i];
       	    if (e.className && re.test(e.className)) r[l++] = e;
       	}
   	}
    return r;
}