////////////////////////////////////////////////////////////////////																////	Define double state file references for each main nav		////	button. For additional buttons create incrementally larger	////	groups (eg. six_on, seven_on).								////																////////////////////////////////////////////////////////////////////if ( browser ){	twelve_on = new Image; twelve_on.src="http://www.malepregnancy.com/images/science_over.gif";	twelve_off = new Image; twelve_off.src="http://www.malepregnancy.com/images/science_off.gif";	twelve_active = new Image; twelve_active.src="http://www.malepregnancy.com/images/science_on.gif";		thirteen_on = new Image; thirteen_on.src="http://www.malepregnancy.com/images/mingwei_over.gif";	thirteen_off = new Image; thirteen_off.src="http://www.malepregnancy.com/images/mingwei_off.gif";	thirteen_active = new Image; thirteen_active.src="http://www.malepregnancy.com/images/mingwei_on.gif";		fourteen_on = new Image; fourteen_on.src="http://www.malepregnancy.com/images/faqs_over.gif";	fourteen_off = new Image; fourteen_off.src="http://www.malepregnancy.com/images/faqs_off.gif";	fourteen_active = new Image; fourteen_active.src="http://www.malepregnancy.com/images/faqs_on.gif";	fifteen_on = new Image; fifteen_on.src="http://www.malepregnancy.com/images/boards_over.gif";	fifteen_off = new Image; fifteen_off.src="http://www.malepregnancy.com/images/boards_off.gif";	fifteen_active = new Image; fifteen_active.src="http://www.malepregnancy.com/images/boards_on.gif";	sixteen_on = new Image; sixteen_on.src="http://www.malepregnancy.com/images/film_over.gif";	sixteen_off = new Image; sixteen_off.src="http://www.malepregnancy.com/images/film_off.gif";	sixteen_active = new Image; sixteen_active.src="http://www.malepregnancy.com/images/film_on.gif";	seventeen_on = new Image; seventeen_on.src="http://www.malepregnancy.com/images/news_over.gif";	seventeen_off = new Image; seventeen_off.src="http://www.malepregnancy.com/images/news_off.gif";	seventeen_active = new Image; seventeen_active.src="http://www.malepregnancy.com/images/news_on.gif";	}