function array_map( callback ) {	// Applies the callback to the elements of the given arrays
	// 
	// +   original by: Andrea Giammarchi (http://webreflection.blogspot.com)
	// +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)


	var argc = arguments.length, argv = arguments;
	var j = argv[1].length, i = 0, k = 1, m = 0;
	var tmp = [], tmp_ar = [];

	while (i < j) {
		while (k < argc){
			tmp[m++] = argv[k++][i];
		}

		m = 0;
		k = 1;

		if( callback ){
			tmp_ar[i++] = callback.apply(null, tmp);
		} else{
			tmp_ar[i++] = tmp;
		}

		tmp = [];
	}

	return tmp_ar;
}