function winSub(url,x,y,bln,scr) { /* This fuction pops up an external link (i.e. target="_blank"). */
	window.open(url,'','width=' + x + ',height=' + y + ',scrollbars=' + bln + ',top=50,left=50,resizable=1,menubar=' + bln + ',toolbar=' + bln + ',status=' + bln + ',location=' + scr);
}

function changeArw(param,way) { /* This function changes the direction of the arrow for the mainNav. */
	var actv = new Array('arwOrder','arwAvailable','arwResources','arwFees','arwClient','arwAbout');
	var param;
	var way;
	document.images[actv[param]].src='img/ico_arw' + way + '.gif';
	}

function tellAFriend(refererURL,refTitle) { /* This function allows the user to invite a friend to visit Genetrack Web site. */
	if (!refererURL) {
		refererURL = window.location.href;
		}
	
	if (!refTitle) {
		var refererTitle = document.title;
		title = encodeURI(refererTitle);
		}
		
		else {
			title = 'Genetrack - ' + refTitle;
			}
		
	var refererTitle = document.title;
	winSub('p_tell_a_friend.php?ref_url=' + encodeURI(refererURL) + '&ref_title=' + title, 570, 500, 0);
}

function printPage(refererURL) { /* This function allows the user print the page in a printer-friendly format. */
	if (!refererURL) {
		refererURL = window.location.href;
		}
		
	var refererTitle = document.title;
	winSub(encodeURI(refererURL) + '&ref_title=' + encodeURI(refererTitle), 800, 600, 1, 0);
}

function improveSite(refererURL) { /* This function allows the user to rate the Healthcord Web site. */
	if (!refererURL) {
		refererURL = window.location.href;
		}
		
	var refererTitle = document.title;
	winSub('p_improve.php?ref_url=' + encodeURI(refererURL) + '&ref_title=' + encodeURI(refererTitle), 480, 460, 0);
}