// ====================================================================
// 
//  ALTTXT V1.2
//  BY: BRIAN GOSSELIN OF SCRIPTASYLUM.COM
//  Added fading effect for IE4+ and NS6+ only and optimized the code a bit.
//  Script featured on Dynamic Drive (http://www.dynamicdrive.com) 
// 
// ====================================================================

var dofade = true;				// Enables fade-in effect for IE4+ and NS6 only
var center = false;				// Centers the box uner the mouse, otherwise displays box to the right of the mouse
var centertext = false;		// Centers the text inside the box. you can't simply do this via style because of NS4.
														// Otherwise, text is left-justified. 

// ====================================================================
// NO NEED TO EDIT BEYOND THIS POINT																										|
// ====================================================================

var NS4 = (navigator.appName.indexOf("Netscape")>=0 && !document.getElementById)? true : false;
var IE4 = (document.all && !document.getElementById)? true : false;
var IE5 = (document.getElementById && document.all)? true : false;
var NS6 = (document.getElementById && navigator.appName.indexOf("Netscape")>=0 )? true: false;
var W3C = (document.getElementById)? true : false;
var w_y, w_x, navtxt, boxheight, boxwidth;
var ishover = false;
var isloaded = false;
var ieop = 0;
var op_id = 0;

function getwindowdims() {
	w_y = (NS4 || NS6) ? window.innerHeight : (IE5 || IE4)? document.body.clientHeight : 0;
	w_x = (NS4 || NS6) ? window.innerWidth : (IE5 || IE4)? document.body.clientWidth : 0;
}

function getboxwidth() {
	if (NS4) {
		boxwidth = (navtxt.document.width) ? navtxt.document.width : navtxt.clip.width;
	}
	if (IE5 || IE4) {
		boxwidth = (navtxt.style.pixelWidth) ? navtxt.style.pixelWidth : navtxt.offsetWidth;
	}
	if (NS6) {
		boxwidth = (navtxt.style.width) ? parseInt(navtxt.style.width) : parseInt(navtxt.offsetWidth);
	}
	boxwidth += 15;
}

function getboxheight() {
	if (NS4) {
		boxheight = (navtxt.document.height) ? navtxt.document.height : navtxt.clip.height;
	}
	if (IE4 || IE5) {
		boxheight = (navtxt.style.pixelHeight) ? navtxt.style.pixelHeight : navtxt.offsetHeight;
	}
	if (NS6) {
		boxheight = parseInt(navtxt.offsetHeight);
	}
}

function movenavtxt(x, y) {
	if (NS4) {
		navtxt.moveTo(x,y);
	}
	if (W3C || IE4) {
		navtxt.style.left = x + 'px';
		navtxt.style.top = y + 'px';
	}
}

function getpagescrolly() {
	if (NS4 || NS6) {
		return window.pageYOffset;
	}
	if (IE5 || IE4) {
		return document.body.scrollTop;
	}
}

function getpagescrollx() {
	if (NS4 || NS6) {
		return window.pageXOffset;
	}
	if (IE5 || IE4) {
		return document.body.scrollLeft;
	}
}

function writeindiv(text){
	if (NS4) {
		navtxt.document.open();
		navtxt.document.write(text);
		navtxt.document.close();
	}
	if (W3C || IE4) {
		navtxt.innerHTML = text;
	}
}

function hideprivateKBTypes() {
	for (var i=0; i<document.all["kbType"].length; i++) {
		document.all["kbType"][i].style.visibility = "hidden";
	}
}

function showprivateKBTypes() {
	for (var i=0; i<document.all["kbType"].length; i++) {
		document.all["kbType"][i].style.visibility = "visible";
	}
}

//**** END UTILITY FUNCTIONS ****//

function writetxt(text) {
	if (isloaded) {
		if (text != 0) {
			// hide all kbTypes (items that the popup layer won't show on top off)
			//hideprivateKBTypes();
			
			ishover = true;
			if (NS4) {
				text = '<SPAN class="navtext">' + ((centertext) ? '<center>' : '') + text + ((centertext) ? '</center>' : '') + '</div>';
			}
			writeindiv(text);
			getboxheight();
			if ((W3C || IE4) && dofade) {
				ieop = 0;
				incropacity();
			}
		} else {
			// hide all kbTypes (items that the popup layer won't show on top off)
			//showprivateKBTypes();
			
			if (NS4) {
				navtxt.visibility="hide";
			}
			if (IE4 || W3C) {
				if (dofade) {
					clearTimeout(op_id);
				}
				navtxt.style.visibility = "hidden";
			}
			writeindiv('');
			ishover = false;
		}
	}
}

function incropacity() {
	if (ieop <= 100) {
		ieop += 7;
		if (IE4 || IE5) {
			navtxt.style.filter = "alpha(opacity="+ieop+")";
		}
		if (NS6) {
			navtxt.style.MozOpacity = ieop / 100;
		}
		op_id = setTimeout('incropacity()', 20);
	}
}

function moveobj(evt){
	if (isloaded && ishover) {
		margin = (IE4 || IE5) ? 1 : 23;
		
		if (NS6) {
			if (document.height + 27 - window.innerHeight < 0) {
				margin = 15;
			}
		}
		
		if (NS4) {
			if (document.height - window.innerHeight < 0) {
				margin = 10;
			}
		}
		
		//mx=(NS4||NS6)? evt.pageX : (IE5||IE4)? event.clientX : 0;
		//my=(NS4||NS6)? evt.pageY : (IE5||IE4)? event.clientY : 0;
		
		if (NS4) {
			mx = evt.pageX;
			my = evt.pageY;
		} else if (NS6) {
			mx = evt.clientX
			my = evt.clientY
		} else if (IE5) {
			mx = event.clientX
			my = event.clientY
		} else if (IE4) {
			mx = 0
			my = 0
		}
		
		if (NS4) {
			mx -= getpagescrollx();
			my -= getpagescrolly();
		}
		
		xoff = (center) ? mx-boxwidth / 2 : mx + 5;
		
		// added to force the popup above the link
		//yoff = (my + boxheight + 30 - getpagescrolly() + margin >= w_y) ? -15 - boxheight : 30;
		yoff = -8 - boxheight;
		//alert("my = " + my + ", boxheight = " + boxheight + ", getpagescrolly() = " + getpagescrolly() + ", margin = " + margin);
		
		movenavtxt(Math.min(w_x - boxwidth - margin, Math.max(2, xoff)) + getpagescrollx(), my + yoff + getpagescrolly());
		
		if (NS4) {
			navtxt.visibility = "show";
		}
		if (W3C || IE4) {
			navtxt.style.visibility = "visible";
		}
	}
}

if(NS4)document.captureEvents(Event.MOUSEMOVE);
document.onmousemove=moveobj;
window.onload=function(){
  navtxt=(NS4)? document.layers['navtxt'] : (IE4)? document.all['navtxt'] : (W3C)? document.getElementById('navtxt') : null;
  getboxwidth();
  getboxheight();
  getwindowdims();
  isloaded=true;
  if((W3C || IE4) && centertext)navtxt.style.textAlign="center";
  if(W3C)navtxt.style.padding='4px';
  if(IE4 || IE5 && dofade)navtxt.style.filter="alpha(opacity=0)";
  }
window.onresize=getwindowdims;