function GetWidth(){
	  var x = 0;
	  if (self.innerHeight) {		  
			  x = self.innerWidth-17.5;
	  }
	  else if (document.documentElement && document.documentElement.clientHeight){
			  x = document.documentElement.clientWidth;			  
	  }
	  else if (document.body){
			  x = document.body.clientWidth;			 
	  }
	  return x;
}


function setPosition(id, positionX){
	if(!document.getElementById(id)) return false;
	var object = document.getElementById(id);
	var widths=0;
	if(positionX != ''){
		widths = positionX;
	}
	else {
		widths =Math.round( (GetWidth() - object.offsetWidth)/2);	
	}
	object.style.left = widths + 'px';	
}

function setClass(obj, classname) {
	if(!obj) { return false; }
	if(document.getElementById("tab"+defaultTab).className) {
		document.getElementById("tab"+defaultTab).className = "";
	}
	obj.className = classname;
	if(classname == "") {
		document.getElementById("tab"+defaultTab).className = defaultTab;
	}
}
function addListener(element, type, expression, bubbling){
   var  bubbling = bubbling || false;
   if(window.addEventListener) { // Standard
	  element.addEventListener(type, expression, bubbling);
	  return true;
   } else if(window.attachEvent) { // IE
	  element.attachEvent('on' + type, expression);
	  return true;
   } else return false;
}