function calc_left (w) 

{

	var left = (screen.availWidth / 2) - (w / 2);

	return (left);

}



function calc_top (h) 

{

	var top = (screen.availHeight / 2) - (h / 2);

	return (top);

}



function open_popup (url, w, h) 

{

	var top = calc_top (h);

	var left = calc_left (w);



	popup = window.open (url,'','scrollbars=yes,width='+w+',height='+h+',left='+left+',top='+top+',screenX='+left+',screenY='+top);

	popup.focus();

}



function copyright ()

{

	var w = 550;

	var h = 310;

	var url = "copyright.htm";

	

	open_popup(url,w,h);

}



function no_spam (user,domain) {

  locationstring = "mailto:" + user + "@" + domain;

  window.location = locationstring;

}