var oneon = new Image(); oneon.src = 'mym_images/btn1_over.gif';
var oneoff = new Image(); oneoff.src = 'mym_images/btn1.gif'; 
var twoon = new Image(); twoon.src = 'mym_images/btn2_over.gif';
var twooff = new Image(); twooff.src = 'mym_images/btn2.gif';
var threeon = new Image(); threeon.src = 'mym_images/btn3_over.gif';
var threeoff = new Image(); threeoff.src = 'mym_images/btn3.gif';
var fouron = new Image(); fouron.src = 'mym_images/btn4_over.gif';
var fouroff = new Image(); fouroff.src = 'mym_images/btn4.gif';
var fiveon = new Image(); fiveon.src = 'mym_images/btn5_over.gif';
var fiveoff = new Image(); fiveoff.src = 'mym_images/btn5.gif';
var sixon = new Image(); sixon.src = 'mym_images/btn6_over.gif';
var sixoff = new Image(); sixoff.src = 'mym_images/btn6.gif';
var sevenon = new Image(); sevenon.src = 'mym_images/btn7_over.gif';
var sevenoff = new Image(); sevenoff.src = 'mym_images/btn7.gif';