function setFontSize(value) {
	document.getElementsByTagName("body")[0].style.fontSize = value;
} 

function getEl(id)
{
    element = document.getElementById(id);

    return element;
}

function hideEl(id)
{
    var element = getEl(id);

    element.style.display = 'none';
}

function showEl(id)
{
    var element = getEl(id);

    element.style.display = '';
}

function ShowHide(sid)
{
    var el = 'info_' + sid;

    if(getEl(el).style.display == 'none') {

        showEl(el);

    } else {

        hideEl(el);

    }
}

function email_valido(FormName,ElemName)
{
var EmailOk  = true
var Temp     = document.forms[FormName].elements[ElemName]
var AtSym    = Temp.value.indexOf('@')
var Period   = Temp.value.lastIndexOf('.')
var Space    = Temp.value.indexOf(' ')
var Length   = Temp.value.length - 1   // Array is from 0 to length-1

if ((AtSym < 1) ||                     // '@' cannot be in first position
    (Period <= AtSym+1) ||             // Must be atleast one valid char btwn '@' and '.'
    (Period == Length ) ||             // Must be atleast one valid char after '.'
    (Space  != -1))                    // No empty spaces permitted
   {  
      EmailOk = false
      alert('Inserire un indirizzo e-mail valido.')
      Temp.focus()
   }
return EmailOk
}