var counter;
for(var i=0;i<100;i++)
{
    if(i==0)i="";
    if(document.getElementById('isbn'+i)||document.getElementById('language'+i)||document.getElementById('galleryID'+i)||document.getElementById('exID'+i)||document.getElementById('2language'+i)||document.getElementById('3language'+i))counter++;
}

function change_element_type(name,new_type) 
{
    var submit_btn = document.getElementById(name);
    submit_btn.type=new_type;
    submit_btn.setAttribute('onclick', 'validate_form()'); 
}