pic1= new Image();
pic1.src="_img/_nav/nav_but_01.gif";
pic2= new Image();
pic2.src="_img/_nav/nav_but_02.gif";
pic3= new Image();
pic3.src="_img/_nav/nav_but_03.gif";
pic4= new Image();
pic4.src="_img/_nav/nav_but_04.gif";
pic5= new Image();
pic5.src="_img/_nav/nav_but_05.gif";
pic6= new Image();
pic6.src="_img/_nav/nav_but_06.gif";
pic7= new Image();
pic7.src="_img/_nav/nav_but_07.gif";
pic8= new Image();
pic8.src="_img/_nav/nav_but_08.gif";
pic9= new Image();
pic9.src="_img/_nav/nav_sub_1_bg.gif";
pic10= new Image();
pic10.src="_img/_nav/nav_sub_2_bg.gif";
pic11= new Image();
pic11.src="_img/_nav/nav_sub_3_bg.gif";
pic12= new Image();
pic12.src="_img/_nav/nav_sub_1_but_01.gif";
pic13= new Image();
pic13.src="_img/_nav/nav_sub_1_but_02.gif";
pic14= new Image();
pic14.src="_img/_nav/nav_sub_1_but_03.gif";
pic15= new Image();
pic15.src="_img/_nav/nav_sub_2_but_01.gif";
pic16= new Image();
pic16.src="_img/_nav/nav_sub_2_but_02.gif";
pic17= new Image();
pic17.src="_img/_nav/nav_sub_2_but_03.gif";
pic18= new Image();
pic18.src="_img/_nav/nav_sub_3_but_01.gif";
pic19= new Image();
pic19.src="_img/_nav/nav_sub_3_but_02.gif";