// rollover effects

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}


function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}


var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		buythebook_over = newImage("images/pagestructure/buythebook_over.gif");
		aboutauthors_over = newImage("images/pagestructure/aboutauthors_over.gif");
		contactus_over = newImage("images/pagestructure/contactus_over.gif");
		advice_over = newImage("images/pagestructure/advice_over.gif");
		trends_over = newImage("images/pagestructure/trends_over.gif");
		namingcustoms_over = newImage("images/pagestructure/namingcustoms_over.gif");
		namelists = newImage("images/pagestructure/namelists_over.gif");
		namingbytheme_over = newImage("images/pagestructure/namingbytheme_over.gif");
		news_over = newImage("images/pagestructure/contactus_over.gif");
		namingbytheme_star_over = newImage("images/pagestructure/namingbytheme_star_over.gif");
		readintroduction_over = newImage("images/pagestructure/readintroduction_over.gif");
		preloadFlag = true;
	}
}