function preload() 
{
  var d = document; 
  
  if(d.images)
  { 
  	if( ! d.xS_p) 
	{
		d.xS_p = new Array();
	}
	
    var i;
	var j = d.xS_p.length;
	var a = preload.arguments; 
	
	for( i = 0; i < a.length; i++ )
	{
    	if( a[i].indexOf("#") != 0 )
		{ 
			d.xS_p[j] = new Image; 
			d.xS_p[j++].src = a[i];
		}
	}
  }
}

window.onload = function() {preload('http://www.drwsimmons.com/images/site/nav_knowledge.png',
						'http://www.drwsimmons.com/images/site/nav_home.png',
						'http://www.drwsimmons.com/images/site/nav_about.png',
						'http://www.drwsimmons.com/images/site/nav_services.png',
						'http://www.drwsimmons.com/images/site/nav_contact.png');
}