function Pager(tableName, itemsPerPage) {
    this.tableName = tableName;
    this.itemsPerPage = itemsPerPage;
    this.currentPage = 1;
    this.pages = 0;
    this.inited = false;

    this.showRecords = function(from, to) {        
        var rows = document.getElementById(tableName).rows;
        // start i from one if you want to use a header row
        for (var i = 0; i < rows.length; i++) {
            if (i < from || i > to)  
                rows[i].style.display = 'none';
            else
                rows[i].style.display = '';
        }
    }

    this.showPage = function(pageNumber) {
    	if (! this.inited) {
    		alert("not initiated");
    		return;
    	}

        var oldPageAnchor = document.getElementById('pg'+this.currentPage);
        oldPageAnchor.className = 'pg-normal';
        var oldPageAnchor = document.getElementById('pg1'+this.currentPage);
        oldPageAnchor.className = 'pg-normal';
        
        this.currentPage = pageNumber;
        var newPageAnchor = document.getElementById('pg'+this.currentPage);
        newPageAnchor.className = 'pg-selected';
        var newPageAnchor = document.getElementById('pg1'+this.currentPage);
        newPageAnchor.className = 'pg-selected';
        
        var from = (pageNumber - 1) * itemsPerPage;
        var to = from + itemsPerPage - 1;
        this.showRecords(from, to);
    }   
    
    this.prev = function() {
        if (this.currentPage > 1)
            this.showPage(this.currentPage - 1);
    }
    
    this.next = function() {
        if (this.currentPage < this.pages) {
            this.showPage(this.currentPage + 1);
        }
    }                        
    
    this.init = function() {
        var rows = document.getElementById(tableName).rows.length;
//        var records = (rows - 1);
        this.pages = Math.ceil(rows / this.itemsPerPage);
		//this.difference = (this.pages*this.itemsPerPage)-records; //calculate difference
        this.inited = true;
    }

    this.showPageNav = function(pagerName, positionId, positionId2) {
    	if (! this.inited) {
    		alert("not initiated");
    		return;
    	}
    	var element = document.getElementById(positionId);
        var element2 = document.getElementById(positionId2);
		var pagerHtml1 = "";
		var pagerHtml2 = "";
		var pagerHtml3 = "";
		var pagerHtml4 = "";
    	pagerHtml1 = '<span onclick="' + pagerName + '.prev();" class="pg-normal"> &#171 Prev </span> | ';
        for (var page = 1; page <= this.pages; page++)
        {
            pagerHtml2 += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span> | ';
            pagerHtml3 += '<span id="pg1' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span> | ';
        }
        pagerHtml4 = '<span onclick="'+pagerName+'.next();" class="pg-normal"> Next &#187;</span>';

        element.innerHTML = pagerHtml1+pagerHtml2+pagerHtml4;
        element2.innerHTML = pagerHtml1+pagerHtml3+pagerHtml4;
    }
}