function SayiKontrol(ths) 
{ 
        if (event.keyCode < 46 || event.keyCode > 57) 
    { 
        event.keyCode = 0; 
        return  false; 
    } 
    else 
        return true; 
} 

 


function undo_format(str)
{
var r_str="";
var len = str.length;
  for (i=0; (i<len) && ( (str.charAt(i)=='0') || (str.charAt(i)==' ')  ) ; i++ );
  str = str.substring(i);
  for (i=0; i<str.length ;i++)
  { 
    if ( (!isNaN(str.charAt(i)) ) && (str.charAt(i)!=' '))
      r_str +=  str.charAt(i);  
  }  
  return r_str;
}

function do_format(str)
{
var r_str="";
var k=1;
var i=str.length-1;
  for (; i>-1 ;i--)
  {
    if (k==3)    
    {
      r_str = str.charAt(i) + r_str; 
      if (i!=0)
         r_str = "," + r_str;
      k=0;
    }
    else
    {
      r_str = str.charAt(i) + r_str; 
    }
    k++; 
  }
  return r_str;
}

function format_tutar(e)
{
 var un_fstr = undo_format(e.value);
 //if(e = document.form1.fiyat) document.form1.fiyat2.value=un_fstr;
 e.value= do_format(un_fstr); 
}




function IsNumeric(nesne)
{
var ValidChars = "0123456789";
var IsNumber=true;
var Char;

for (i = 0; i < nesne.value.length && IsNumber == true; i++) 
{ 
Char = nesne.value.charAt(i); 
if (ValidChars.indexOf(Char) == -1) 
{
nesne.value = nesne.value.substring(0,i);
break;
}
}
return IsNumber;
}