// Document Name:	observer_scripts.js
// Description:		Scripts used in Observer pages

// Preload and mouseover functions
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) {
		nav1_over = newImage("http://www.psychologicalscience.org/images/format/for_members-over.gif");
		nav1_nav2_over = newImage("http://www.psychologicalscience.org/images/format/convention-for_members_over.gif");
		nav2_over = newImage("http://www.psychologicalscience.org/images/format/convention-over.gif");
		nav2_nav3_over = newImage("http://www.psychologicalscience.org/images/format/journals-convention_over.gif");
		nav3_over = newImage("http://www.psychologicalscience.org/images/format/journals-over.gif");
		nav4_over = newImage("http://www.psychologicalscience.org/images/format/advocacy-over.gif");
		nav5_over = newImage("http://www.psychologicalscience.org/images/format/employment_ads-over.gif");
		nav5_nav6_over = newImage("http://www.psychologicalscience.org/images/format/join_aps-employment_over.gif");
		nav6_over = newImage("http://www.psychologicalscience.org/images/format/join_aps-over.gif");
		
		sidea_over = newImage("http://www.psychologicalscience.org/images/format/button-over.gif");
		side1b_over = newImage("http://www.psychologicalscience.org/images/format/about-over.gif");
		side2b_over = newImage("http://www.psychologicalscience.org/images/format/media-over.gif");
		side3b_over = newImage("http://www.psychologicalscience.org/images/format/observer-over.gif");
		side4b_over = newImage("http://www.psychologicalscience.org/images/format/teaching-over.gif");
		side5b_over = newImage("http://www.psychologicalscience.org/images/format/funding-over.gif");
		side6b_over = newImage("http://www.psychologicalscience.org/images/format/contact-over.gif");
		side7b_over = newImage("http://www.psychologicalscience.org/images/format/links-over.gif");
		side8b_over = newImage("http://www.psychologicalscience.org/images/format/students-over.gif");
	
		preloadFlag = true;
	}
}

// Background color change script
// NOTE: This works for IE5+ and NS6+ only
function changeColor(item,state) {
	if (document.getElementById) {
		if (state == 'on') {
			loc = eval("document.getElementById('" + item + "')");
			loc.style.background = "#FFCC66";
		} else {
			if (state == 'off') {
				loc = eval("document.getElementById('" + item + "')");
				loc.style.background = "#EEEEEE";
			}
		}
	}
}

// validates search form submission
function validSearch(form) {
	if (form.Criteria.value.length == 0) {
		alert("Please enter your search term(s) before continuing.");
		form.Criteria.focus();
		return false;
	}
}