function number_only(myfield, e, dec)
{
	var key;
	var keychar;
	if (window.event)
		key = window.event.keyCode;
	else if (e)
		key = e.which;
	else
		return true;
	keychar = String.fromCharCode(key);
	if ((key==null) || (key==0) || (key==8) || (key==9) || (key==12) || (key==13)
			|| (key==27) || (key==37) || (key==39) || (key==46))
	  return true;
	else if((key >= 48 && key <= 57) || key >= 96 && key <= 105)
		return true;
	// decimal point jump
	else if (dec && (keychar == ".")){
		myfield.form.elements[dec].focus();
		return false;
	} else
		return false;
}

// Numeric only control handler
jQuery.fn.ForceNumericOnly =
function()
{
    return this.each(function()
    {
        $(this).keydown(function(e)
        {
            var key = e.charCode || e.keyCode || 0;
            // allow backspace, tab, delete, arrows, numbers and keypad numbers ONLY
            return (
                key == 8 || 
                key == 9 ||
                key == 46 ||
                (key >= 37 && key <= 40) ||
                (key >= 48 && key <= 57) ||
                (key >= 96 && key <= 105));
        })
    })
};