<!-- For javascript form control

// Array Function 

function makeArray() {
var args = makeArray.arguments;

    for (var i = 0; i < args.length; i++) {
    this[i] = args[i];
    }
this.length = args.length;
}

// This array holds the descriptions and names of the pages.

var pages = new makeArray(" -- Jump to --",
"- - - - - - - - - - - - -",
"Introduction",
"Heat and Chemical Reactions",
"Fuels and Combustion",
"Heats of Formation",
"Dissolving Salts",
"Bond Energies",
"Heats of Reactions",
"Benzene and Resonance",
"Why is Fire Hot?",
"- - - - - - - - - - - - -",
"Questions",
"- - - - - - - - - - - - -",
"Another Chapter..?");


// This array hold the URLs of the pages.

var urls = new makeArray("",
"",
"default.htm",
"Page_4.htm",
"Page_14.htm",
"Page_19.htm",
"Page_25.htm",
"Page_27.htm",
"Page_30.htm",
"Page_32.htm",
"Page_35.htm",
"",
"questions.htm",
"",
"http://www.chem.ox.ac.uk/vrchemistry/foundation.html");






// This function determines which page is selected and goes to it.

function goPage(form) {
i = form.menu.selectedIndex;            
    if (i != 0) {
    window.location.href = urls[i];  
    }
}
//-->