function Pager(tableName, itemsPerPage) {
    this.tableName = tableName;
    this.itemsPerPage = itemsPerPage;
    this.currentPage = 1;
    this.pages = 0;
    this.inited = false;
	this.pagerDiv = '';
	this.cutoff = 5;
    
    this.showRecords = function(from, to) {        
        var rows = document.getElementById(tableName).rows;
        // i starts from 1 to skip table header row
        for (var i = 1; 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 inited");
    		return;
    	}

        this.currentPage = pageNumber;
		this.showPageNav('pager', this.pagerDiv);

		var oldPageAnchor = document.getElementById('pg'+this.currentPage);
		if (oldPageAnchor != null)
	        oldPageAnchor.className = 'pg-normal';
        
        var newPageAnchor = document.getElementById('pg'+this.currentPage);
		if (newPageAnchor != null)
			newPageAnchor.className = 'pg-selected';
        
        var from = (pageNumber - 1) * itemsPerPage + 1;
        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;
        var records = (rows.length - 1); 
        this.pages = Math.ceil(records / itemsPerPage);
        this.inited = true;
    }

    this.showPageNav = function(pagerName, positionId) {
		this.pagerDiv = positionId;
		
    	if (! this.inited) {
    		alert("not inited");
    		return;
    	}
    	var element = document.getElementById(positionId);
    	
//    	var pagerHtml = '<span onclick="' + pagerName + '.prev();" class="pg-normal"> &#171 Prev </span>';    	
		var pagerHtml = '<span onclick="' + pagerName + '.prev();" class="pg-normal"> &lt; </span>';
		
		/*
        for (var page = 1; page <= this.pages; page++) 
		{
			if ((page <= 10) || (page == this.pages))
			{
	            pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span>';			
			}
			else
			{
				if (page == 11)
					pagerHtml += ' [...] ';
			}
		}
        */
		
		pagerHtml += '<span id="pg1" class="pg-normal" onclick="' + pagerName + '.showPage(1);">1</span>';
		
		if (this.currentPage > (this.cutoff + 2)) //to prevent printing dots between 1 and 2   [1][...][2][3][4]
			pagerHtml += '<span style="cursor: default"> [...] </span>';
				
        for (var page = (this.currentPage - this.cutoff); page <= this.pages; page++) 
		{
			if (page > 1)
			{
				if (page <= this.currentPage + this.cutoff)
					pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span>';
			}
		}

		if ((this.currentPage + this.cutoff) < (this.pages - 1))
			pagerHtml += '<span style="cursor: default"> [...] </span>';
		
		if ((this.currentPage + this.cutoff) < this.pages)
			pagerHtml += '<span id="pg' + this.pages + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + this.pages + ');">' + this.pages + '</span>';
		
//		pagerHtml += '<span onclick="'+pagerName+'.next();" class="pg-normal"> Next &#187;</span>';            
		pagerHtml += '<span onclick="'+pagerName+'.next();" class="pg-normal"> &gt; </span>';            

		element.innerHTML = pagerHtml;
    }
}