function popaWindow(url) {
intro = window.open(url,'intro','width=670,height=500,resizable=0,scrollbars=0,toolbar=0,directories=0,status=0,');
var width = 670; 
var height = 500;
var aw = screen.availWidth; 
var ah = screen.availHeight; 
var xPos = (aw - width)/2; 
var yPos = (ah - height)/2; 
intro.moveTo(xPos,yPos);
	}
	
	
function fullScreen(theURL) {
window.open(theURL, '', 'fullscreen=yes, scrollbars=auto');
}


function imgSwap(oImg)
{
   var strOver  = "_on"    // image to be used with mouse over
   var strOff = "_off"     // normal image
   var strImg = oImg.src
   if (strImg.indexOf(strOver) != -1) 
      oImg.src = strImg.replace(strOver,strOff)
   else
      oImg.src = strImg.replace(strOff,strOver)
}