Set the value of combobox in javascript, set the value of html select value in javascript

Problem: Set the value of a combobox in javascript
Solution: For combobox give the values and names.
for ex:
Test1Test2Test3

Screenshot:

Javascript code to set the value of combobox:

document.forms[0].Combo.value="Test2";

i put the above code in Onload of the body. so by default the combo box value is "Test2".

The above code should work 99%. If the above javascript code is not working then use this:

for (var i=0; i (lessthan symbol here) document.forms[0].Combo.length; i++) {

if (document.forms[0].Combo[i].value == "Test2") {

document.forms[0].Combo[i].selected = true;

}

}