Why You Should Use Var

Click on the Display1 button, read the message box and close it. Then click on the Display2 button - read and close. Then click on the Display1 button again.

<SCRIPT>

var func1 = "This is the global variable named func1";

function Display1() {
alert(func1);
}

function Display2() {
var func1 = "This is local variable named func1"; // by declaring func1 here, we made it a local var

alert(func1);
}

</SCRIPT>

<FORM>
<INPUT TYPE="button" NAME="ButtonDisplay1" VALUE="Display1"
onClick="Display1();">
<INPUT TYPE="button" NAME="ButtonDisplay2" VALUE="Display2"
onClick="Display2();">
</FORM>