Find a second largest number in array with Javascript

Back to the simple coding questions. This time with javascript – it seems the easiest language to test with.
Code for the problem can be run over here: http://js.do/code/svetliy-second-largest

var first_largest;
var second_largess;

function large(a_list){
if (a_list.length == 0 || a_list.length == 1)
	return "None";


if (a_list[0] > a_list[1]){
    first_largest = a_list[0];
    second_largest = a_list[1];
} else {
    first_largest = a_list[1];
    second_largest = a_list[0];
}

for (var i=2; i<a_list.length; i++){
    if (a_list[i] > first_largest){
        second_largest = first_largest;
        first_largest = a_list[i];
        continue;
    }

    if (a_list[i] > second_largest){
    second_largest = a_list[i];
    }
} 

return(second_largest);
}

var a_list = [1, 3, 4, 5, 0, 2];
document.write(large(a_list));

array, javascript