function pageMainMenu() {
    $(" #nav ul ").css({display: "none"}); // Opera Fix
    $(" #nav li").hover( function() {
	    $(this).find("ul:first").css({visibility: "visible",display: "none"}).show(400);
	}, function(){
	    $(this).find("ul:first").css({visibility: "hidden"});
	});
}

function goOnHistory(iTimes){
	history.go(iTimes);
	return false;
}

function numbersOnly(myfield, e, dec) {
	var key;
	var keychar;
	
	if (window.event)
		key = window.event.keyCode;
	else if (e)
		key = e.which;
	else
		return true;
	keychar = String.fromCharCode(key);

	// control keys
	if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) )
		return true;

	// numbers
	else if ( (("0123456789").indexOf(keychar) > -1))
		return true;

	// decimal point jump
	else if (dec && (keychar == ".")) {
		myfield.form.elements[dec].focus();
		return false;
	}
	else
		return false;
}
		
function rollImage(imageName, sPDesc, sPage) {
	var dv = document.getElementById("dvRollImage");
	var dvPSumm = document.getElementById("hplProjectSummary");
	dv.setAttribute("class", imageName)
	dvPSumm.innerHTML = sPDesc;
	dvPSumm.setAttribute("href", sPage+".php?sProjectName="+imageName)
	return false;
}