function numbersonly(myfield, e, dec)
{
var key;
var keychar;
var strnumbers;
if (dec==true){
	strnumbers ='1234567890,'
}else{
	strnumbers ='1234567890'
}

if (window.event)
   key = window.event.keyCode;
else if (e)
   key = e.which;
else
   return true;
keychar = String.fromCharCode(key);

// control keys
if ((key==null) || (key==0) || (key==8) || 
    (key==9) || (key==13) || (key==27) )
   return true;

// numbers
else if (((strnumbers).indexOf(keychar) > -1))
   return true;
else
   return false;
}