var tdStart;

var divPager;

var pagerWidth;

var tableThumb;

var tableThumbLeft;

var tableThumbLeftNew;

var forwardBtn;

var backBtn;

var tableFirstChild;

var tableLastChild;

var Timer;



function disableForwardBtn(){

	forwardBtn.className = "pagerButtonDisabled";

	MM_swapImage('lastSlide','images/last_slide1.png','images/last_slide.png',1);

}

function disableBackBtn(){

	backBtn.className = "pagerButtonDisabled";

	MM_swapImage('firstSlide','images/first_slide1.png','images/first_slide.png',1);

}

function enableForwardBtn(){

	forwardBtn.className = "pagerButtonEnabled";

	MM_swapImage('lastSlide','images/last_slide.png','images/last_slide1.png',1);

}

function enableBackBtn(){

	backBtn.className = "pagerButtonEnabled";

	MM_swapImage('firstSlide','images/first_slide.png','images/first_slide1.png',1);

}



function tableCheckLeft(){

	if (tableThumbLeftNew >= 0){

		tableThumbLeftNew = 0;

		disableBackBtn();

		tdStart = tableFirstChild;

	} else {

		enableBackBtn();

	}

}

function tableCheckRight(){

	tableThumbRight = tableThumbLeftNew + tableThumb.offsetWidth;

	if (tableThumbRight <= pagerWidth){

		tableThumbLeftNew +=  pagerWidth - tableThumbRight;

		disableForwardBtn();

		tdStart = tableLastChild;

	} else {

		enableForwardBtn();

	}

}



function thumbPagerInit(){

	tdStart = document.getElementById('td_current');

	divPager = document.getElementById('thumbPagerContainer');

	pagerWidth = divPager.offsetWidth;

	tableThumb = document.getElementById('tableThumbPager');

	forwardBtn = document.getElementById('forwardButton');

	backBtn = document.getElementById('backButton');

	tableFirstChild = tableThumb.rows[0].cells[0];

	tableLastChild = tableThumb.rows[0].cells[tableThumb.rows[0].cells.length-1];

	var curTdLeft = tdStart.offsetLeft;

	var curTdWidth = tdStart.offsetWidth;

	if (tdStart == tableFirstChild) {

		tableThumbLeft = 0;

		disableBackBtn();

	}

	else if (tdStart == tableLastChild) {

		tableThumbLeft = pagerWidth - tableThumb.offsetWidth;

		disableForwardBtn();

	}

	else {

		tableThumbLeft = pagerWidth/2-curTdLeft-curTdWidth/2;

	}

	tableThumbLeftNew = tableThumbLeft;

	tableCheckRight();

	tableCheckLeft();

	divPager.scrollLeft = - tableThumbLeftNew;

}



function pagerScrollLeft() {

	if(tableThumbLeft < tableThumbLeftNew) {

		tableThumbLeft += 30;

		if (tableThumbLeft > tableThumbLeftNew) {

			tableThumbLeft = tableThumbLeftNew;

		}

		divPager.scrollLeft =  - tableThumbLeft;

	} else {

		clearInterval(Timer);

	}

}

function pagerScrollRight() {

	if(tableThumbLeft > tableThumbLeftNew) {

		tableThumbLeft -= 30;

		if (tableThumbLeft < tableThumbLeftNew) {

			tableThumbLeft = tableThumbLeftNew;

		}

		divPager.scrollLeft =  - tableThumbLeft;

	} else {

		clearInterval(Timer);

	}

}



function scrollBack(){

	if (tdStart == tableFirstChild) return;

	tableThumbLeft = tableThumbLeftNew;

	if (tableThumbLeft == 0) return;

	tdFound = false;

	clearInterval(Timer);

	tdStartLeft = tdStart.offsetLeft - Math.abs(tableThumbLeft);

	if (tdStartLeft == 0) {

		tdFound = true;

		tdStart = tdStart.previousSibling;

	}

	while(!tdFound){

		if (tdStart.previousSibling) {

			tdSibling = tdStart.previousSibling;

		}

		else break;

		tdSiblingLeft = tdSibling.offsetLeft - Math.abs(tableThumbLeft);

		tdSiblingRight = tdSiblingLeft + tdSibling.offsetWidth;

		if ( ((tdSiblingLeft < 0)&&(tdSiblingRight > 0)) || ((tdSiblingRight <= 0)&&(tdStartLeft > 0)) ) {

			tdFound = true;

			tdStart = tdSibling;

		} else if(tdSiblingLeft == 0) {

			tdFound = true;

			tdStart = tdSibling.previousSibling;

		} else {

			tdStart = tdSibling;		

		}

	}

	tdStartLeft = tdStart.offsetLeft - Math.abs(tableThumbLeft);

	tdStartRight = tdStartLeft + tdStart.offsetWidth;

	tableThumbLeftNew = tableThumbLeft + pagerWidth - tdStartRight;

	tableCheckLeft();

	tableCheckRight();

	Timer = setInterval("pagerScrollLeft()", 1);

}



function scrollForward(){

	if (tdStart == tableLastChild) return;

	tableThumbLeft = tableThumbLeftNew;

	tableThumbRight = tableThumbLeft + tableThumb.offsetWidth;

	if (tableThumbRight <= pagerWidth) return; 

	tdFound = false;

	clearInterval(Timer);

	tdStartRight = tdStart.offsetLeft - Math.abs(tableThumbLeft) + tdStart.offsetWidth;

	if (tdStartRight == pagerWidth) {

		tdFound = true;

		tdStart = tdStart.nextSibling;

	}

	while(!tdFound){

		if (tdStart.nextSibling) {

			tdSibling = tdStart.nextSibling;

		}

		else break;

		tdSiblingLeft = tdSibling.offsetLeft - Math.abs(tableThumbLeft);

		tdSiblingRight = tdSiblingLeft + tdSibling.offsetWidth;

		if ( ((tdSiblingLeft < pagerWidth)&&(tdSiblingRight > pagerWidth)) || ((tdSiblingLeft >= pagerWidth)&&(tdStartRight < pagerWidth)) ) {

			tdFound = true;

			tdStart = tdSibling;

		} else if(tdSiblingRight == pagerWidth) {

			tdFound = true;

			tdStart = tdSibling.nextSibling;

		} else {

			tdStart = tdSibling;		

		}

	}

	tdStartLeft = tdStart.offsetLeft - Math.abs(tableThumbLeft);

	tableThumbLeftNew = tableThumbLeft - tdStartLeft;

	tableCheckRight();

	tableCheckLeft();

	Timer = setInterval("pagerScrollRight()", 1);

}