function getObj(objID) {
	var element;
	
	if (document.all && !document.getElementById) {
		//alert("Internet Explorer 4");
		// Internet Explorer 4
		element = document.all[objID];
	}
	if (document.all && document.getElementById) {
		//alert("Internet Explorer 5");
		// Internet Explorer 5
		element = document.getElementById(objID);
	}
	if (document.layers) {
		//alert("Netscape 4");
		// Netscape 4
		element = document.layers[objID];
	}
	if (!document.all && document.getElementById) {
		//alert("Netscape 6");
		// Netscape 6
		element = document.getElementById(objID);
	}
	
	if(element)
		return element;
}

function getObjInFrame(obj,frm) {
	
	if (document.all && !document.getElementById) {
		//alert("Internet Explorer 4");
		// Internet Explorer 4
		return eval('top.'+frm+'.document.all(obj)');
	}
	if (document.all && document.getElementById) {
		//alert("Internet Explorer 5");
		// Internet Explorer 5
		return eval('top.'+frm+'.document.getElementById(obj)');
	}
	if (document.layers) {
		//alert("Netscape 4");
		// Netscape 4
		return eval('top.'+frm+'.document.layers(obj)');
	}
	if (!document.all && document.getElementById) {
		//alert("Netscape 6");
		// Netscape 6
		return eval('top.'+frm+'.document.getElementById(obj)');
	}
}

function redirect(url) {
	window.location = url;
}

//funzioni per la verifica della corretteza di una data
var minYear=1900;
var maxYear=2100;
var dtCh='/';
var strOut="";

function isInteger(s)
{
	if( s.length == 0 )
		return false;

	if( s == parseInt(s,10) )
		return true;
	else
		return false;
}

function trimString(str)
{
  return str.replace(/^\s+/g, '').replace(/\s+$/g, '');
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		strOut="-la data deve essere nel formato gg/mm/aaaa\n"
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		strOut="-il mese non è stato inserito correttamente\n"
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		strOut="-il giorno non è stato inserito correttamente\n"
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		strOut="L'anno deve essere nel formato aaaa\n"
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		strOut="-la data non è corretta\n"
		return false
	}
return true
}

function isCorrectDate(g,m,a){
	dt=g+'/'+m+'/'+a;
	if (isDate(dt)==false){
		return false
	}
    return true
}

function isCorrectDateString(dt){
	if (isDate(dt)==false){
		return false
	}
    return true
}