function numbersOnly(e)
{
 var key;
 var keychar;
 if (window.event)
     key = window.event.keyCode;
 else if (e)
     key = e.which;
 else
     return true;
 keychar = String.fromCharCode(key);
 keychar = keychar.toLowerCase();
 // control keys
 if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) || (key==37)  || (key==38)  || (key==39)  || (key==40)  || (key==96)  || (key==97)  || (key==98)  || (key==99)  || (key==100)  || (key==101)  || (key==102)  || (key==103)  || (key==104)  || (key==105)  || (key==46) )
     return true;
 //  numbers
 else if ((("0123456789  ").indexOf(keychar) > -1))
     return true;
 else
     return false;
 }