//preload function
function preL(){

	if (document.images) {
	

	Mnav1 = newImage('http://www.nrgenergy.com/assets/hm/about.gif');
	Mnav2 = newImage('http://www.nrgenergy.com/assets/hm/media.gif');
	Mnav3 = newImage('http://www.nrgenergy.com/assets/hm/careers.gif');
	Mnav4 = newImage('http://www.nrgenergy.com/assets/hm/contactUs.gif');
	Mnav5 = newImage('http://www.nrgenergy.com/assets/hm/locations.gif');
	Mnav6 = newImage('http://www.nrgenergy.com/assets/hm/investor.gif');	

	Mnav1_o = newImage('http://www.nrgenergy.com/assets/hm/about_o.gif');
	Mnav2_o = newImage('http://www.nrgenergy.com/assets/hm/media_o.gif');
	Mnav3_o = newImage('http://www.nrgenergy.com/assets/hm/careers_o.gif');
	Mnav4_o = newImage('http://www.nrgenergy.com/assets/hm/contactUs_o.gif');
	Mnav5_o = newImage('http://www.nrgenergy.com/assets/hm/locations_o.gif');
	Mnav6_o = newImage('http://www.nrgenergy.com/assets/hm/investor_o.gif');	

	nav1_0 = newImage('http://www.nrgenergy.com/assets/hm/nav1_0.gif');
	nav1_1 = newImage('http://www.nrgenergy.com/assets/hm/nav1_1.gif');
	nav1_2 = newImage('http://www.nrgenergy.com/assets/hm/nav1_2.gif');
	nav1_3 = newImage('http://www.nrgenergy.com/assets/hm/nav1_3.gif');
	nav1_4 = newImage('http://www.nrgenergy.com/assets/hm/nav1_4.gif');
	nav1_5 = newImage('http://www.nrgenergy.com/assets/hm/nav1_5.gif');
	nav1_6 = newImage('http://www.nrgenergy.com/assets/hm/nav1_6.gif');
	
	nav1_0_o = newImage('http://www.nrgenergy.com/assets/hm/nav1_0_o.gif');
	nav1_1_o = newImage('http://www.nrgenergy.com/assets/hm/nav1_1_o.gif');
	nav1_2_o = newImage('http://www.nrgenergy.com/assets/hm/nav1_2_o.gif');
	nav1_3_o = newImage('http://www.nrgenergy.com/assets/hm/nav1_3_o.gif');
	nav1_4_o = newImage('http://www.nrgenergy.com/assets/hm/nav1_4_o.gif');
	nav1_5_o = newImage('http://www.nrgenergy.com/assets/hm/nav1_5_o.gif');
	nav1_6_o = newImage('http://www.nrgenergy.com/assets/hm/nav1_6_o.gif');
	
	}
		

}