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;
        // 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(pageNumber==1)
		{
			//document.getElementById('prevdivdisplay').disabled=true;
			//alert(document.getElementById('prevdivdisplay').className);
			document.getElementById('prevdivdisplay').className="search";
		}
		else
		{
			//document.getElementById('prevdivdisplay').disabled=false;
			document.getElementById('prevdivdisplay').className="forgot";
		}
		
		if(this.pages==pageNumber)
		{
			//document.getElementById('nextdivdisplay').disabled=true;
			document.getElementById('nextdivdisplay').className="search";
		}
		else
		{
			//document.getElementById('nextdivdisplay').disabled=false;
			document.getElementById('nextdivdisplay').className="forgot";
		}
		
		if (! this.inited) {
    		alert("not inited");
    		return;
    	}

        var oldPageAnchor = document.getElementById('pg'+this.currentPage);
        oldPageAnchor.className = 'forgot';
        
        this.currentPage = pageNumber;
        var newPageAnchor = document.getElementById('pg'+this.currentPage);
        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) {
		//alert("pagerName: "+pagerName);
		//alert("pagerName: "+positionId);

		if (! this.inited) {
    		alert("not inited");
    		return;
    	}
    	var element = document.getElementById(positionId);

/*    	if(pagecount >=1)
		{
				pagerHtml = '<span onclick="' + pagerName + '.prev();" class="forgot" style="cursor:pointer"> Previous </span>';
		}
*/		
    	var pagerHtml = '<span onclick="' + pagerName + '.prev();" class="forgot" style="cursor:pointer" id="prevdivdisplay"> Previous </span>';
        for (var page = 1; page <= this.pages; page++)
            pagerHtml += '<span id="pg' + page + '" class="forgot" onclick="' + pagerName + '.showPage(' + page + ');">' + '</span>';        
		pagerHtml += '<span onclick="'+pagerName+'.next();" class="forgot" style="cursor:pointer" id="nextdivdisplay">&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Next</span>';        
       //alert(pagerHtml);
	   element.innerHTML = pagerHtml;
    }
}