function popUpWindow(url, windowName, w, h) {
    var windowProperties = '';
	var sizable = 'no';
	var scrolling = 'no';	
		
    if (screen.height - 10 < h) {
	  h = screen.height * .90;
	  sizable = 'yes'
	  scrolling = 'yes';
    }	
	
    if (screen.width - 10 < w) {
	  w = screen.width * .90;
	  sizable = 'yes'
	  scrolling = 'yes';
    }
	  
    var l = (screen.width - w) / 2;
    var t = (screen.height - h) / 2 - 10;
	
	windowProperties = 'width=' + w +
         	           ',height=' + h +  
         	           ',left=' + l +  
         	           ',top=' + t +   
         	           ',scrollbars=' + scrolling + 
         	           ',toolbars=no' + 
         	           ',resizable=' + sizable + 
         	           ',location=no' + 
         	           ',menubars=no';
  
    newWindow = window.open(url,windowName,windowProperties);
    newWindow.focus();
  
  }

function findObj(nm, fr, img){
  
  var o;
  var w=parent.frames[fr];
  if(w)var d=w.document;
  if(d.getElementById) {
	o=d.getElementById(nm);
  } else {	
	if (d.Layers) { 
	  o=d.Layers[nm];
	} else {	
	  o=d[nm];
	}
  }	
   
  return o;
  
}
  
function changeHeader(newHeader){
  
  if(top.oldHeader != newHeader) {
  //if(!oldHeader) { 
  //  var o=findObj(newHeader,'header'); 
  //  if(o) { if(o.style) { o=o.style; o.visibility='hidden'; } else { o.visibility='hide'; } }
  //} else { 
    var o=findObj(top.oldHeader,'header'); 
    if(o) { if(o.style) { o=o.style; o.visibility='hidden'; } else { o.visibility='hide'; } }
  //}
  }
    
  o=findObj(newHeader,'header');  
  if(o) { if(o.style) { o=o.style; o.visibility='visible'; } else { o.visibility='show'; } }
  
  top.oldHeader=newHeader;
  
}