function toggle(elementID) {

element = document.getElementById(elementID);

 if(element)
 {
 if(element.style.display == 'none' || element.style.display == '') {
 element.style.display = 'block';
 element.style.visibility = 'visible';
 }
 else {
 element.style.display = 'none';
 element.style.visibility = 'hidden';
 }
 }
}