// JavaScript Document
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) {
     //alert('pageNumber' + pageNumber);
	 if (! this.inited) {
      //alert("not inited");
      return;
     }

        try{
		var oldPageAnchor = document.getElementById('pg'+this.currentPage);
        //alert('oldPageAnchor:--' + oldPageAnchor.id);
		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);
		
		var pgNext = document.getElementById('pgNext');
        var pgPrev = document.getElementById('pgPrev');
        if (this.currentPage == this.pages)
            pgNext.style.display = 'none';
			//{
			//pgNext.style.color = "gray";
			//pgNext.style.cursor = "default";
			//}
        else
            pgNext.style.display = '';
			
		if (this.currentPage == 1)
            pgPrev.style.display = 'none';
			//{
			//pgPrev.style.color = "gray";
			//pgPrev.style.cursor = "default";
			//}
        else
            pgPrev.style.display = '';

		
		}catch(e){
			document.getElementById("pageNavPosition").style.display = "none";
			}
    }  
   
    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() {
        try{
		var rows = document.getElementById(tableName).rows;
        var records = (rows.length - 1);
        this.pages = Math.ceil(records / itemsPerPage);
        this.inited = true;
		}catch(e){}
    }

    this.showPageNav = function(pagerName, positionId) {
     //alert('positionId:-' +positionId);
	 
	 if (! this.inited) {
      //alert("not inited");
      return;
     }
     var element = document.getElementById(positionId);
     
	 var pagerHtml = '<span id="pgPrev" onclick="' + pagerName + '.prev();" class="pg-normal"> &#171 Prev </span> | ';
        //alert('PagesCount:-' + this.pages);
		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 &#187;</span>';           
       
        
		element.innerHTML = pagerHtml;
		//alert(element.innerHTML);
    }
}