/*		toggle visibility:		*/

function element(id) {
    return document.getElementById(id); }

function invert(id) {
    div = element(id);
    if (div.style.display == 'block') {
        div.style.display = 'none'; }
    else {
        div.style.display = 'block'; } }

function hide(id) {
    div = element(id);
    div.style.display = 'none'; }

function show(id) {
    div = element(id);
    div.style.display = 'block'; }


function toggleCols() {

	div1 = element("areaLeft");
	div2 = element("areaRight");


	if(div1.style.display == 'none') {
		div1.style.display = 'block';
		div2.style.display = 'none';
		document.images.arrowLeft.src = 'images/Arrow_on_left.jpg';
		document.images.arrowRight.src = 'images/Arrow_off_right.jpg';
		element('leftArrowText').style.color = '#41b1c8'; // blue
		element('rightArrowText').style.color = '#999999'; // grey
	}

		else {
		div2.style.display = 'block';
		div1.style.display = 'none';
		document.images.arrowLeft.src = 'images/Arrow_off_left.jpg';
		document.images.arrowRight.src = 'images/Arrow_on_right.jpg';
		element('rightArrowText').style.color = '#41b1c8'; // blue
		element('leftArrowText').style.color = '#999999'; // grey

	}


}