How is the following code useful?

function validate(field)
{
var valid="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var ok="yes";
var temp;

for(var i=0; i < field.value.length; i++)
{

temp="" + field.value.substring(i,i+1)
if(valid.indexOf(temp)=="-1")
{
ok="no";
break;
}
}
if(ok=="no")
{
alert("error");
field.focus();
}
}

What does DHTML Stand For?

What value is displayed in the following code? <div id="id">0</div> <script> document.getElementById('id').innerHTML = 1 document.getElementsByTagName('div').innerHTML = 2 document.getElementsByTagName('div')[0].innerHTML = 3 </script>

Which of the following is TRUE about code written in <%= %>?

Which of the following is true about the function : object.addEventListener(click, doThis, capture)?

What technology does DHTML use to produce dynamic content?