function galleryPager(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");
       // alert(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;
    	}
    	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 pgPrev = document.getElementById('pgPrev');						
			var pgNext = document.getElementById('pgNext');
			var pgLast = document.getElementById('pgLast');
			//alert(this.pages);
			if (pageNumber == this.pages){
				pgNext.style.visibility = 'hidden';
				pgLast.style.visibility = 'hidden';
			}
			else{
				pgNext.style.visibility = 'visible';
				pgLast.style.visibility = 'visible';
			}
			if (pageNumber == 1){
				pgPrev.style.visibility = 'hidden';
				pgFirst.style.visibility = 'hidden';
			}
			else{
				pgPrev.style.visibility = 'visible'; 
				pgFirst.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.first = function() {
    	this.showPage(1);
    }
    
    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.last=function(){
    //alert(this.pages);
    this.showPage(this.pages);
    
    }                       
    
    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 pagerHtml = '<span id="pgFirst" onclick="' + pagerName + '.first();" class="pg-normal">First</span> ';
    		pagerHtml += '<span id="pgPrev" onclick="' + pagerName + '.prev();" class="pg-normal">Prev</span> ';
        for (var page = 1; page <= this.pages; page++) 
            pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span>  ';
        	pagerHtml += '<span id="pgNext" onclick="'+pagerName+'.next();" class="pg-normal">Next</span>';  
        	  pagerHtml += '<span id="pgLast" onclick="'+pagerName+'.last();" class="pg-normal">Last</span>';             
        
        element.innerHTML = pagerHtml;
    }
}