function roundNumber(num, dec) {
	var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
	return result;
}

// JavaScript Document
$(document).ready( function() {
	$( "#myM" ).keyup( function() {
		var surfCouvByUnit = $( "#surfbyunit" ).val();
		var surfToCover = $( "#myM" ).val();
		var quantity = Math.ceil( surfToCover / surfCouvByUnit )
		$( "#quantity_wanted" ).val( quantity );
	$( "#quantity_wanted_display" ).text( quantity );

	//	$("#myM").val( roundNumber( quantity*surfCouvByUnit, 2 )  );
	});
});