Display all selected value of multiple drop down list

how about this??

function printAll() {

var str="",i;

for (i=0;i<myForm.myOption.options.length;i++) {
    if (myForm.myOption.options[i].selected) {
        str = str + i + " ";
    }
}

alert("Options selected are " + str);
}

Good Luck!!!

You can do something like this:

function printAll() {

    var obj = myForm.myOption,
        options = obj.options, 
        selected = [], i, str;

    for (i = 0; i < options.length; i++) {
        options[i].selected && selected.push(obj[i].value);
    }

    str = selected.join();

    // what should I write here??
    alert("Options selected are " + str);
}

Demo: http://jsfiddle.net/n3cXj/1/