var hwWidth = 400;
var hwHeight = 500;

function showHelp(helpPage)
{
	// calculate window location for centering
	var winX = (screen.width - hwWidth) / 2;
	var winY = (screen.height - hwHeight) / 2;
	
	// open window
	var hw = window.open(helpPage,'helpWindow','toolbar=no,scrollbars=yes,width='+hwWidth+',height='+hwHeight+',left='+winX+',top='+winY);			
	
	// return false
	return(false);
}