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 (! this.inited) {
    		alert("not inited");
    		return;
    	}
			
			var oldPageAnchor = document.getElementById(tableName+'1-'+this.currentPage);
			if (oldPageAnchor!=null) oldPageAnchor.className = 'pg-normal';
			var oldPageAnchor2 = document.getElementById(tableName+'2-'+this.currentPage);
        	if (oldPageAnchor2!=null) oldPageAnchor2.className = 'pg-normal';
        
        	this.currentPage = pageNumber;
        	var newPageAnchor = document.getElementById(tableName+'1-'+this.currentPage);			
			if (newPageAnchor!=null) newPageAnchor.className = 'pg-selected';
        	var newPageAnchor2 = document.getElementById(tableName+'2-'+this.currentPage);			
        	if (newPageAnchor2!=null) newPageAnchor2.className = 'pg-selected';

			
        	var from = (pageNumber - 1) * itemsPerPage + 1;
        	var to = from + itemsPerPage - 1;
        	this.showRecords(from, to);	
			//alert(pageNumber+ 'vs' +oldPageAnchor.innerHTML)
        
    }   
    
    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, positionId1, positionId2) {
    	if (! this.inited) {
    		alert("not inited");
    		return;
    	}
    	var element1 = document.getElementById(positionId1);
    	var element2 = document.getElementById(positionId2);
		var showBtn;
		var pagerHtml = '<span onclick="' + pagerName + '.prev()" class="pg-normal"><img style="margin:0px" src="/plt/cd/channel/channel/irc/iln/bluearrow_left.gif" alt="'+p_prev+'" title="'+ p_prev +'"></span> | ';
		var pagerHtml2 = '<span onclick="' + pagerName + '.prev();ScrollToTop();" class="pg-normal"><img style="margin:0px" src="/plt/cd/channel/channel/irc/iln/bluearrow_left.gif" alt="'+p_prev+'" title="'+ p_prev +'"></span> | ';
    	
		for (var page = 1; page <= this.pages; page++) {
            pagerHtml += '<span id="' + tableName + '1-'+page+'" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span> | ';
			pagerHtml2 += '<span id="' + tableName + '2-'+page+'" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');ScrollToTop();">' + page + '</span> | ';      
			if (page > 1) showBtn="show";  	           
        }
		
		pagerHtml += '<span onclick="'+pagerName+'.next();" class="pg-normal"><img style="margin:0px" src="/plt/cd/channel/channel/irc/iln/bluearrow_right.gif" alt="'+ p_next +'" title="'+ p_next +'"></span>'; 
		pagerHtml2 += '<span onclick="'+pagerName+'.next();ScrollToTop();" class="pg-normal"><img style="margin:0px" src="/plt/cd/channel/channel/irc/iln/bluearrow_right.gif" alt="'+ p_next +'" title="'+ p_next +'"></span>'; 
		
		if (!showBtn) {
			pagerHtml="";
			pagerHtml2="";
		}
		
        element1.innerHTML = pagerHtml;
        element2.innerHTML = pagerHtml2;
    }
}

function ScrollToTop(){document.body.scrollTop = 0;}