function expandDiv(obj) {
var el = document.getElementById(obj);
if ( el.style.display != "none" ) {
el.style.display = "none";
window.focus();
}
else
{
el.style.display = "";
window.focus();
}
}

function collapseDiv(obj) {
var el = document.getElementById(obj);
el.style.display = "none";
window.focus();
}

function showDiv(obj) {
var el = document.getElementById(obj);
el.style.display = "block";
window.focus();
}

function hideDivOnClick(action, obj) {
var el = document.getElementById(obj);
if(action.checked == false) el.style.display = "block";
else el.style.display = "none";
window.focus();
}

function textCounter(field, countfield, maxlimit) {
if (field.value.length > maxlimit) // if too long...trim it!
field.value = field.value.substring(0, maxlimit);
// otherwise, update 'characters left' counter
else
countfield.value = maxlimit - field.value.length;
}

function verify_field(myfield,  e, charset)
{
var key;
var keychar;

if (window.event)
   key = window.event.keyCode;
else if (e)
   key = e.which;
else
   return true;
keychar = String.fromCharCode(key);

// control keys
if ((key==null) || (key==0) || (key==8) ||
    (key==9) || (key==13) || (key==27) )
   return true;

// caractere aceptate
else if (((charset).indexOf(keychar) > -1))
   return true;
else
   return false;
}