var leftdisabled = true;
var rightdisabled = true;
var widthLength = 640;

function fp_ie4() {
	var nav = navigator.appVersion.indexOf("MSIE");
	return (nav>0) && (parseInt(navigator.appVersion.substring(nav+5, nav+6)) >= 4);
}

function fp_ns6() {
	return ((navigator.appName == "Netscape") &&
				(parseInt(navigator.appVersion.substring(0, 1)) >= 5))
}

function fp_ShowImg(src, sWidth, sHeight, sID, iIndex)
{	
	var el = document.images["fpGalleryMainImg_" + sID];
	if (el) {		
		el.src = src.getAttribute ? src.getAttribute("lowsrc") : src.lowsrc;
		el.style.width = sWidth;
		el.style.height = sHeight;			
	}
}

function fp_ScrollLeft(sID) {	
	var el = document.getElementById("fpGalleryListCell_" + sID);	
	if (el) {
		var coll = el.getElementsByTagName("A");
		var count = 20;

		if (coll) {
			for (i=1;i<coll.length;i++) {
				if (coll[i].style.display != "none") {
					coll[i-1].style.display = "inline";
					break;	
				}
			}
			
			for (i=0;i<coll.length;i++) {
				if (coll[i].style.display != "none") {
					var images = coll[i].getElementsByTagName("img");
					count = count + 20 + images[0].width;
					
					if (count > widthLength)				
						coll[i].style.display = "none";
				}
			}

			if ((el.scrollWidth) >= el.clientWidth) {								
				var btn = document.getElementById("fpGalleryRightBtn_" + sID);
				if (btn && rightdisabled) {					
					rightdisabled = false;
					te = btn.src;
					btn.src = btn.getAttribute ? btn.getAttribute("lowsrc") : btn.lowsrc;
					btn.lowsrc = te;
					btn.title = "Scroll right";
					btn.alt = "Scroll right";
				}
			}
			
			if (coll[0].style.display != "none") {
				var btn = document.getElementById("fpGalleryLeftBtn_" + sID);
				if (btn && !leftdisabled) {
					leftdisabled = true;
					te = btn.src;
					btn.src = btn.getAttribute ? btn.getAttribute("lowsrc") : btn.lowsrc;
					btn.lowsrc = te;
					btn.title = "";
					btn.alt = "";
				}
			}
		}
		
	}
}

function fp_ScrollRight(sID) {
	var el = document.getElementById("fpGalleryListCell_" + sID);	
	if (el) {
		if (!rightdisabled)
		{			
			var coll = el.getElementsByTagName("A");
			
			if (coll) {
			    var state = 0;
				var count = 20;
				for (i=0;i<coll.length;i++) {
					if (state == 0)
					{
						if (coll[i].style.display != "none") {
							coll[i].style.display = "none";	
							state = 1;
						}
					}
					else{						
						var images = coll[i].getElementsByTagName("img");
						count = count + 20 + images[0].width;						
						if (count <= widthLength)
							coll[i].style.display = "inline";
						else
							coll[i].style.display = "none";
					}
				}
			}
		
			var btn = document.getElementById("fpGalleryRightBtn_" + sID);
			if (btn && coll[coll.length - 1].style.display != "none") {
				rightdisabled = true;
				te = btn.src;
				btn.src = btn.getAttribute ? btn.getAttribute("lowsrc") : btn.lowsrc;
				setTimeout("assignSrc('" + btn.id + "','" + btn.src + "')",100);
				btn.lowsrc = te;
				btn.title = "";
				btn.alt = "";
			}
			

			var btn = document.getElementById("fpGalleryLeftBtn_" + sID);			
		
			if (btn && leftdisabled) {				
				te = btn.src;
				btn.src = btn.getAttribute ? btn.getAttribute("lowsrc") : btn.lowsrc;								
				setTimeout("assignSrc('" + btn.id + "','" + btn.src + "')",100);
				btn.lowsrc = te;
				leftdisabled = false;
				btn.title = "Scroll left";
				btn.alt = "Scroll left";
			}
		}		
	}
}

function assignSrc(element, src) {	
	document.getElementById(element).src = src;
}