function switch1(div) {
if (document.getElementById('one')) {
var option=['one','two','three', 'four', 'extra', ];
for(var i=0; i<option.length; i++)
{ obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div)? "block" : "none"; }
}
}
//
function switchImg(i){
document.images["tydi"].src = i;
}


function switch2(div) {
if (document.getElementById('five')) {
var option=['five','six','seven', 'eight', 'nine', 'ten', 'eleven', 'twelve', ];
for(var i=0; i<option.length; i++)
{ obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div)? "block" : "none"; }
}
}

//
function switchImg(i){
document.images["tydi"].src = i;
}