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how we get find the chkbox value in combobox

Hello,

i have add this code to my html file but i want to find the value of checkbox when i checked the checkedbox. if i click on chckebox then it will alert be" india " please tell me how we find the value of chackbox bcoz i i am already alert the value but it gives me nothing.
please reply me as soonas possible

<input type="checkbox" name="testchk[]" value="india" id="testchk[]">



combo.attachEvent("onCheck",function(value,state){

alert("seema");
var chk=socument.getElementById('testchk[]').checkd;
var chk1=chk.length;
alert(chk1);

alert(value);
return true

})