function Pager(tableName, itemsPerPage,headerRow) {
    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;
        
        for (var i = headerRow; i < rows.length -1; 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;
    	}
		
        var oldPageAnchor
                
        for (var page = 1; page <= this.pages; page++)
	{
		oldPageAnchor = document.getElementById('pg'+page);
        	oldPageAnchor.className = 'FormPageNumber';
        }        
        this.currentPage = pageNumber;
        var newPageAnchor = document.getElementById('pg'+this.currentPage);
        newPageAnchor.className = 'ActiveFormPageNumber';
        
        var from = (pageNumber - 1) * itemsPerPage + headerRow;
        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 - headerRow) - 1 ; 
        this.pages = Math.ceil(records / itemsPerPage);
        this.inited = true;
    }

    this.showPageNav = function(pagerName, positionId) {
    	if (! this.inited) {
    		alert("not inited");
    		return;
    	}
    	var element = document.getElementById(positionId);    	
    	if (this.pages > 1)
    		var pagerHtml = '<span onclick="' + pagerName + '.prev();" class="FormPageNumber"> &#171 Prev </span> <span class="FormBodyText">|</span> ';
    	else
    		var pagerHtml = '<span onclick="' + pagerName + '.prev();" class="FormPageNumber"> &#171 Prev </span> <span class="FormBodyText">|</span> ';
    		
        for (var page = 1; page <= this.pages; page++) 
            pagerHtml += '<span id="pg' + page + '" class="FormPageNumber" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span> <span class="FormBodyText">|</span> ';
        
        if (this.pages > 1)
        	pagerHtml += '<span onclick="'+pagerName+'.next();" class="FormPageNumber"> Next &#187;</span>';
        else
        	pagerHtml += '<span onclick="'+pagerName+'.next();" class="FormPageNumber"> Next &#187;</span>';
        
        element.innerHTML = pagerHtml;
    }
}