SOURCE

function createComparisonFunction(propertyName){
		return function(object1, object2){
		var value1 = object1[propertyName];
		var value2 = object2[propertyName];
		
			if(value1 < value2){
				return -1;
			}else if(value1 > value2){
				return 1;
			}else{
				return 0;
			}
		};
	}

var compare = createComparisonFunction("name");
var result = compare({name:"Nicholas"},{name:"Greg"});
alert(result)