var missionnav1 = new Image();
var missionnav2 = new Image();
var missionnav3 = new Image();
var missionnav4 = new Image();
var missionnav5 = new Image();
var missionnav6 = new Image();
var missionnav7 = new Image();
var missionnav8 = new Image();
var missionnav9 = new Image();
var missionnav10 = new Image();
var missionnav11 = new Image();
var missionnav12 = new Image();

missionnav1.src  = "http://www.japan.ea.com/mohfl/mission1/mission1_but.gif";
missionnav2.src  = "http://www.japan.ea.com/mohfl/mission1/mission1_but_on.gif";
missionnav3.src  = "http://www.japan.ea.com/mohfl/mission1/mission2_but.gif";
missionnav4.src  = "http://www.japan.ea.com/mohfl/mission2/mission2_but_on.gif";
missionnav5.src  = "http://www.japan.ea.com/mohfl/mission1/mission3_but.gif";
missionnav6.src  = "http://www.japan.ea.com/mohfl/mission3/mission3_but_on.gif";
missionnav7.src  = "http://www.japan.ea.com/mohfl/mission1/mission4_but.gif";
missionnav8.src  = "http://www.japan.ea.com/mohfl/mission4/mission4_but_on.gif";
missionnav9.src  = "http://www.japan.ea.com/mohfl/mission1/mission5_but.gif";
missionnav10.src = "http://www.japan.ea.com/mohfl/mission5/mission5_but_on.gif";
missionnav11.src = "http://www.japan.ea.com/mohfl/mission1/mission6_but.gif";
missionnav12.src = "http://www.japan.ea.com/mohfl/mission6/mission6_but_on.gif";