What is the problem in checkbox code

HI,

The folwing code is not working. If i am giving "labels" it working. when i change to labels[]" then its not working. Bcos i have to use "labels[]" then only PHP is taking the values. Please help me.

<

input type="checkbox" name="labels[]" value="spring">Spring
				<input type="checkbox" name="labels[]" value="hibernate">Hibernate
				<input type="checkbox" name="labels[]" value="seam">JBoss Seam
				<input type="checkbox" name="labels[]" value="javafx">JavaFX
				<input type="checkbox" name="labels[]" value="jsf">JSF

Code (markup):

for (i = 0; i < document.add_links.labels.length; i++) {
		if (document.add_links.labels[i].checked == true)
		{
			count++;
		}
	}

Code (markup):

 

Try:

var nBox = document.getElementsByName("labels[]");
for (i=0; i<nBox.length; i++)
            {
              if (nBox[i].checked)
                     {
                       alert("Box " + i + " is checked");
                     }
            }

Code (markup):