m1 = new Image();
m1.src = "images/m1.jpg";

m2 = new Image();
m2.src = "images/m2.jpg";

m3 = new Image();
m3.src = "images/m3.jpg";

m4 = new Image();
m4.src = "images/m4.jpg";

m5 = new Image();
m5.src = "images/m5.jpg";

m1h = new Image();
m1h.src = "images/m1h.jpg";

m2h = new Image();
m2h.src = "images/m2h.jpg";

m3h = new Image();
m3h.src = "images/m3h.jpg";

m4h = new Image();
m4h.src = "images/m4h.jpg";

m5h = new Image();
m5h.src = "images/m5h.jpg";

function changeImg(k,m){
   document.images[k].src = eval(m + '.src');

}