function $(id){
  return typeof id == "string" ? document.getElementById(id) : id;
}

function addClass( objNode, strNewClass ) {
	replaceClass( objNode, strNewClass, '' );
}

function replaceClass( objNode, strNewClass, strCurrClass ) {
	var strOldClass = strNewClass;
	if ( strCurrClass && strCurrClass.length ){
		strCurrClass = strCurrClass.replace( /\s+(\S)/g, '|$1' );
		if ( strOldClass.length ) strOldClass += '|';
		strOldClass += strCurrClass;
	}
	objNode.className = objNode.className.replace( new RegExp('(^|\\s+)(' + strOldClass + ')($|\\s+)', 'g'), '$1' );
	objNode.className += ( (objNode.className.length)? ' ' : '' ) + strNewClass;
}

function matchClass( objNode, strCurrClass ) {
	return ( objNode && objNode.className.length && objNode.className.match( new RegExp('(^|\\s+)(' + strCurrClass + ')($|\\s+)') ) );
}

function getElementsByClassName(objParentNode, strNodeName, strClassName){
	var nodes = objParentNode.getElementsByTagName(strNodeName);
	if(!strClassName){
		return nodes;	
	}
	var nodesWithClassName = [];
	for(var i=0; i<nodes.length; i++){
		if(matchClass( nodes[i], strClassName )){
			//nodesWithClassName.push(nodes[i]);
			nodesWithClassName[nodesWithClassName.length] = nodes[i];
		}	
	}
	return nodesWithClassName;
}



function getObjectReference(obj) {
  return typeof obj == "string" ? document.getElementById(obj) : obj;
}

function getObjectLeft(obj) {
  var objRef = getObjectReference(obj);
  var result = 0;
  if (document.defaultView) {
    var style = document.defaultView;
    var cssDecl = style.getComputedStyle(objRef, "");
    result = cssDecl.getPropertyValue("left");
  } else if (objRef.currentStyle) {
    result = objRef.currentStyle.left;
  } else if (objRef.style) {
    result = objRef.style.left;
  }
  return parseInt(result);
}