jQuery.fn.ForceNumericOnly = function()
{
    return this.each(function()
    {
        jQuery(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));
        })
    })
};

jQuery(document).ready(
	function()
	{
		jQuery('input.numeric-only').ForceNumericOnly();
	});