function verifyDate(str)

   {
   //var str = data;
   var format=0;
   var month=0;
   var day=0;
   var year=0;
   var err=false;
   if(str.length!=10)
      err=true;

   if(str.length==10)
      {
      // dd/mm/yyyy format
      if(str.charAt(2) == "/" && str.charAt(5) == "/" && str.length == 10)
         {
         format=1;
         // Check that day is a number.
         for (var i = 0; i < 2; i++) 
            { var ch = str.substring(i, i + 1); if(ch < "0" || "9" < ch) err=true; }
         // Check that month is a number.
         for (var i = 3; i < 5; i++) 
            { var ch = str.substring(i, i + 1); if(ch < "0" || "9" < ch) err=true; }
         // Check that year is a number.
         for (var i = 6; i < 10; i++) 
            { var ch = str.substring(i, i + 1); if(ch < "0" || "9" < ch) err=true; }
         // Set variables
         if(err==
             false){day=eval(str.substring(0,2));month=eval(str.substring(3,5));  year=eval(str.substring(6,str.length)); }
         }


      // Incorrect format.
      if(format !=1)
         var err=true;
      }

		   // Check that month is between 1 &12.
		   if(month<=0 || month>=13)
		      err=true;
		
		  // Check that day is right depending on month.
		   if( month==2 && ((year/4)==parseInt(year/4)) )
		      { if(day<=0 || day>29) err=true; }
		   if( month==2 && ((year/4)!=parseInt(year/4)) )
		      { if(day<=0 || day>28) err=true; }
		   if( month==4 || month==6 || month==9 || month==11 )
		      { if(day<=0 || day>30) err=true; }
		   if( month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12 )
		      { if(day<=0 || day>31) err=true; }
		
		
		   // If anything appears incorrect, display error message.
		   if(err==true)
		      {
		    //  alert("Inserire la data nel formato gg/mm/aaaa");
					
		      return false;
		      }
		
		   // If all is OK, return true.
		   return true;
		
	   }			
function checkMail(str){return str.search(/^([\w\.\-])+@(([\w\-]{2,})+\.)+([a-z0-9]{2,})+$/i)!=-1};

Number.prototype.format = function(n){
	n = n||2;
	var factor = Math.pow(10,n);
	var x = Math.round(this * factor) / factor;
	return x.toFixed(n).replace(/(\d{1,3})(?=(?:\d{3})+\.)|\./g,function($1){return $1=="."?",":$1+"."});
}