/*
 *
 *  /thr5arts.js
 *  master jscripts
 *	
 *	rev 20070310 
 *
 *  thrive | arts
 *	socially conscious design, web development, advertising and marketing for the arts community
 *	3610 Park Blvd
 *  San Diego, Ca 92103 USA
 *  mbl: +1 619 8139423
 *  eml: info@thr5.com
 *  web: www.thrivearts.com
 *
 */
 
 
/*  
 *	FUNCTION :: tests for DHTML DIV Layer browser support
 *  rev 20060120
 */	
function getDivCompatibility(divID) {
    
    /* 
 	 *  Browser support data from :
 	 *	http://www.howtocreate.co.uk/tutorials/index.php?tut=0&part=14
 	 *	Current as of 20060120
 	 *
	 *  Netscape 4
	 *  Mozilla Rhino engine (Escape 4)
	 *  OmniWeb 4.2
	 */
	if( document.layers ) { return document.layers[divID]; }
    
    /* 
	 *  Newest W3C DOM-compliant browsers, including:
	 *  AOLTV
	 *  iCab 2
	 *  iPanel MicroBrowser with advanced modules
	 *  Internet Explorer 5 Mac
	 *  Internet Explorer 5, 6 Win
	 *  Liberate's TV Navigator
	 *  Mozilla Gecko (FireFox, Netscape 6+)
	 *  Mozilla Rhino engine (Escape 5)
	 *  Mozilla Rhino engine (ICEbrowser)
	 *  Netgem 4 browser (NetBox)
	 *  NetFront
	 *  OpenTV
	 *  Opera 5, 6, 7+
	 *  Safari
	 */
	if( document.getElementById ) { return document.getElementById(divID); }
    
    /* 
	 *  Old browsers and proprietary DOM:
	 *  iCab 2
	 *  Internet Explorer 4, 5 Mac
	 *  Internet Explorer 4, 5, 6 Win
	 *  Mozilla Rhino engine (ClueBrowser)
	 *  Mozilla Rhino engine (Escape 5)
	 *  Mozilla Rhino engine (ICEbrowser)
	 *  OmniWeb 4.1, 4.5+
	 *  Opera 7+
	 *  Safari
	 *  WebTV (MSN TV) Plus and extended Classic
	 */
    if( document.all ) { return document.all[divID]; }
    
    /*
     *	Netscape alternative
     */
    if( document[divID] ) { return document[divID]; }
    
    return false;
}

/*  
 *	FUNCTION :: toggles DHTML DIV Layer ON
 *  rev 20060120
 */
 function showDiv(id) { // Fixed-size version
	var calculate = document.layers ? "" : "px";
	var compatibleBrowser = getDivCompatibility(id);
	if( !compatibleBrowser ) {
		window.alert('Error : Image layers and popups do not work in this browser.'); return;
	}
	if( compatibleBrowser.style ) {
		this.obj = compatibleBrowser.style.display = 'block';
	} else {
		if( compatibleBrowser.visibility ) {
			this.obj = compatibleBrowser.visibility = 'show';
		} else {
			window.alert('Error : Image layers are not supported in this browser. You will not be able to view image enlargements.'); return;
		}
	}
}

/*  
 *	FUNCTION :: centers DHTML DIV in screen, for Netscape browsers
 *  rev 20060120
 */
function centerElement() {
	return ( document.compatMode && document.compatMode!="BackCompat" ) ? document.documentElement : document.body;
}

/*  
 *	FUNCTION :: toggles DHTML DIV Layer OFF
 *  rev 20060120
 */
function hideDiv(id) {
	var compatibleBrowser = getDivCompatibility(id);
	if( !compatibleBrowser ) {
		window.alert('Error : Image layers are not supported in this browser. You will not be able to view image enlargements.'); return;
	}
	if( compatibleBrowser.style ) {
		compatibleBrowser.style.display = 'none';
	} else {
		if( compatibleBrowser.visibility ) {
			compatibleBrowser.visibility = 'hide';
		} else {
			window.alert('Error : Image layers are not supported in this browser. You will not be able to view image enlargements.'); return;
		}
	}
}