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).getElementsByTagName("li");
        // 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;
    	}
    	else
    	{
    		
    		if (jQuery("#"+tableName) && pageNumber!=1 && tableName != "overlaySearchResultId")
    		{
    			var offset = jQuery("#"+tableName).offset();
     			window.scrollTo(offset.left,(offset.top-40));
    		}
    		
    	}
		
		// w3 fix
    		//var pgFirst = document.getElementById('pgFirst');
			var pgNext = document.getElementById('pgNext');
			var pgPrev = document.getElementById('pgPrev');
			//var pgLast = document.getElementById('pgLast');
			
			
			if (pageNumber == this.pages) {
				pgNext.style.visibility = 'hidden';
				//pgLast.style.visibility = 'hidden';
			}
			else{
				pgNext.style.visibility = 'visible';
				//pgLast.style.visibility = 'visible';
			}
			if (pageNumber == 1){
				//pgFirst.style.visibility = 'hidden';
				pgPrev.style.visibility = 'hidden';
			}
			else{
				//pgFirst.style.visibility = 'visible';
				pgPrev.style.visibility = 'visible';
			}
		
		// end
		
        var oldPageAnchor = document.getElementById('pg'+this.currentPage);
        oldPageAnchor.className = 'pg-normal';
        
        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() {
    		if (document.getElementById(tableName))
    		{
		        var rows = document.getElementById(tableName).getElementsByTagName("li");
		        var records = (rows.length - 1); 
		        this.pages = Math.ceil(records / itemsPerPage);
		        this.inited = true;
		     }
		     else
		      	this.inited = false;  

    };

    this.showPageNav = function(pagerName, positionId) {
    	
    	if (! this.inited) {
    		//alert("not inited");
    		return;
    	}
    	var element = document.getElementById(positionId);
    	var pagerHtml = '';
    	var LastElemHTML = '';
    	
    	if(this.pages>=1)
    		//pagerHtml+= '<span id="pgFirst" onclick="' + pagerName + '.showPage(1);" class="pg-normal">First</span> ';
    	
    	 	pagerHtml += '<span id="pgPrev" onclick="' + pagerName + '.prev();" class="pg-normal previous">Previous</span> ';
    	 	
        for (var page = 1; page <= this.pages; page++) 
        {
            pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span> ';
            
//            if(page==this.pages)
//            	LastElemHTML+= '<span id="pgLast" onclick="' + pagerName + '.showPage('+page+');" class="pg-normal">Last</span> ';
//            	
        }
        pagerHtml += '<span id="pgNext" onclick="'+pagerName+'.next();" class="pg-normal next">Next</span>';
        pagerHtml += LastElemHTML;
        
        element.innerHTML = pagerHtml;
    };
}