function categoryClick(){
    if(document.getElementById('gl_form').cat.value==null || document.getElementById('gl_form').cat.value==""){
        alert("You should choose a caregory");
        return;
    }
    document.getElementById('gl_form').show.value = "category";
    document.getElementById('gl_form').submit();
}

function findClick(){
    if (document.getElementById('gl_form').find.value == ""){
        alert("You should enter a search word");
        return;
    }
    document.getElementById('gl_form').show.value = "find";
    document.getElementById('gl_form').submit();
}