var dtCh= "/";
var minYear=2004;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

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){
		alert("Il formato deve essere: dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Inserire un mese valido (01-12)")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Inserire un giorno valido")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Per favore inserisci un anno di quattro cifre compreso tra "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Inserire una data valida")
		return false
	}
return true
}

function openHelp(anchor)
{
        var url = "html/guida.html#" + anchor;
		var larghezza = 550;
		var altezza = 400;
		var rightmargin = 100;

        window.open(url, "Guida", "width="+larghezza+", height="+altezza+", left="+(screen.width-(larghezza+rightmargin))+", top="+((screen.height-altezza)/2)+", scrollbars");
}

function openWin(myUrl, larghezza, altezza)
{
        
		//var larghezza = 750;
		//var altezza = 550;
		var rightmargin = 50;

        window.open(myUrl, "window", "width="+larghezza+", height="+altezza+", left="+(screen.width-(larghezza+rightmargin))+", top="+((screen.height-altezza)/2)+", scrollbars, resizable");
}

function openWinComplete(myUrl, larghezza, altezza, titolo)
{
        
		//var larghezza = 750;
		//var altezza = 550;
		var rightmargin = 50;

        window.open(myUrl, titolo, "width="+larghezza+", height="+altezza+", left="+(screen.width-(larghezza+rightmargin))+", top="+((screen.height-altezza)/2)+", scrollbars, resizable, status, location");
}

function ltrim ( s )
{
	return s.replace( /^\s*/, "" );
}

function rtrim ( s )
{
	return s.replace( /\s*$/, "" );
}

//Combine the rtrim() and ltrim() functions to make the trim() function, which just wraps both calls together:
function trim ( s )
{
	return rtrim(ltrim(s));
}

function regular(stringa, validchars) 
{
    if (!stringa) return false;
    
	if(!validchars)
		validchars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 'אטלעש@.,";

    for (var i = 0; i < stringa.length; i++) {
       if (validchars.indexOf(stringa.charAt(i)) == -1)
          return false;
    }
    return true;
} 

function check_valid_chars(currfield)
{
	if(!regular(currfield.value))
	{
		alert("Caratteri non validi!");
		currfield.value="";
		currfield.select();
		//return false;
	}
	//return true;
}

function email_check(str) {

                var at="@";
                var dot=".";
                var lat=str.indexOf(at);
                var lstr=str.length;
                var ldot=str.indexOf(dot);
                if (str.indexOf(at)==-1)
				{
                   alert("Inserire un indirizzo e-mail valido");
                   return false;
                }

                if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
				{
                   alert("Inserire un indirizzo e-mail valido");
                   return false;
                }

                if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
				{
                    alert("Inserire un indirizzo e-mail valido");
                    return false;
                }

                 if (str.indexOf(at,(lat+1))!=-1)
				 {
                    alert("Inserire un indirizzo e-mail valido");
                    return false;
                 }

                 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
				 {
                    alert("Inserire un indirizzo e-mail valido");
                    return false;
                 }

                 if (str.indexOf(dot,(lat+2))==-1)
				 {
                    alert("Inserire un indirizzo e-mail valido");
                    return false;
                 }

                 if (str.indexOf(" ")!=-1)
				 {
                    alert("Inserire un indirizzo e-mail valido");
                    return false;
                 }

                  return true;
        }