function changeImg_over1(i,j){
  document.img_t1.src=i;
}
function changeImg_out1(i,j){
  document.img_t1.src=i;
}

function changeImg_over2(i,j){
  document.img_t2.src=i;
}
function changeImg_out2(i,j){
  document.img_t2.src=i;
}

function changeImg_over3(i,j){
  document.img_t3.src=i;
}
function changeImg_out3(i,j){
  document.img_t3.src=i;
}

function changeImg_over4(i,j){
  document.img_t4.src=i;
}
function changeImg_out4(i,j){
  document.img_t4.src=i;
}

function changeImg_over5(i,j){
  document.img_t5.src=i;
}
function changeImg_out5(i,j){
  document.img_t5.src=i;
}