• for popup window to work in all browsers use something like this:
  "pop.html" ONCLICK="window.open('pop.html', 'popup', 'scrollbars,resizable,width=150,height=20'); return false"
• use navigator.appname variable to tell you which brand of browser you're dealing with and use parseint(navigator.appversion) variable to return a version number
• include error suppression in your code like:
  

    <SCRIPT LANGUAGE="JavaScript">
    <!--
    function stopError() {
      return true;
    }
    // -->
    </SCRIPT>
    

JavaScript and Java are similar in some ways but fundamentally different in others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript supports most Java expression syntax and basic control-flow constructs. In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a simple, instance-based object model that still provides significant capabilities. JavaScript also supports functions without any special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.

Java is an object-oriented programming language designed for fast execution and type safety. Type safety means, for instance, that you can't cast a Java integer into an object reference or access private memory by corrupting Java bytecodes. Java's object-oriented model means that programs consist exclusively of classes and their methods. Java's class inheritance and strong typing generally require tightly coupled object hierarchies. These requirements make Java programming more complex than JavaScript authoring.

In contrast, JavaScript descends in spirit from a line of smaller, dynamically typed languages like HyperTalk and dBASE. These scripting languages offer programming tools to a much wider audience because of their easier syntax, specialized built-in functionality, and minimal requirements for object creation.

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