function Pager(tableName, itemsPerPage) {
    this.tableName = tableName;
    this.itemsPerPage = itemsPerPage;
    this.currentPage = 1;
    this.pages = 0;
    this.inited = false;
    
    this.showRecords = function(from, to) {      
		if(document.getElementById(tableName)){  
			var rows = document.getElementById(tableName).rows;
			// i starts from 1 to skip table header row and from 0 in other case
			for (var i = 0; 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) {
    		return;
    	}

        var oldPageAnchor = document.getElementById('pg'+this.currentPage);
        if(oldPageAnchor!=null)
			oldPageAnchor.className = 'pg-normal';
        
        this.currentPage = pageNumber;
        var newPageAnchor = document.getElementById('pg'+this.currentPage);
        if(newPageAnchor!=null)
			newPageAnchor.className = 'pg-selected';
        
        var from = (pageNumber - 1) * itemsPerPage + 0;
        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';
        else
            pgNext.style.display = '';
		if (this.currentPage == 1)
            pgPrev.style.display = 'none';
        else
            pgPrev.style.display = '';
    }   
    
    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;
		var records;
		if(document.getElementById(tableName)){
			rows = document.getElementById(tableName).rows;
			records = (rows.length - 0); 
			this.pages = Math.ceil(records / itemsPerPage);
			this.inited = true;
		}
    }

    this.showPageNav = function(pagerName, positionId) {
    	if (! this.inited) {
    		return;
    	}
    	var element = document.getElementById(positionId);
    	var pagerHtml = '';
    	if(this.pages!=0)
    	pagerHtml += '<span id="pgPrev" onclick="' + pagerName + '.prev();" class="pg-normal-link" style="position:relative;top:-2px;"> Pr&eacute;c&eacute;dent </span>';
        for (var page = 1; page <= this.pages; page++) 
            pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span>';
        if(this.pages!=0)
        {
			pagerHtml += '<span id="pgNext" onclick="'+pagerName+'.next();" class="pg-normal-link" style="position:relative;top:-2px;"> Suivant </span>';
			if(document.getElementById('HeadIdeaDiv')!=null)
				document.getElementById('HeadIdeaDiv').style.display = "block";
			if(document.getElementById('HeadNoIdeaDiv')!=null)
				document.getElementById('HeadNoIdeaDiv').style.display = "none";
        }
        else
			{
				/*if(categorieCourante == null)
					categorieCourante = -1;*/
				pagerHtml += '<br/><table><tr><td class="smallBike"><span id="pgPrev"></span><span id="pgNext" class="pg-normal-link"></td></tr></table>';
			if(document.getElementById('HeadIdeaDiv')!=null)
				document.getElementById('HeadIdeaDiv').style.display = "none";		
			
			if(document.getElementById('HeadNoIdeaDiv')!=null)
				document.getElementById('HeadNoIdeaDiv').style.display = "block";				
		}
        element.innerHTML = pagerHtml;
    }
     this.showPageNavEvent = function(pagerName, positionId) {
    	if (! this.inited) {
    		return;
    	}
    	var element = document.getElementById(positionId);
    	var pagerHtml = '';
    	if(this.pages!=0)
    	pagerHtml += '<span id="pgPrev" onclick="' + pagerName + '.prev();" class="pg-normal-link" style="position:relative;top:-2px;"> Pr&eacute;c&eacute;dent </span>';
        for (var page = 1; page <= this.pages; page++) 
            pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span>';
        if(this.pages!=0)
        {
			pagerHtml += '<span id="pgNext" onclick="'+pagerName+'.next();" class="pg-normal-link" style="position:relative;top:-2px;"> Suivant </span>';
			if(document.getElementById('HeadIdeaDiv')!=null)
				document.getElementById('HeadIdeaDiv').style.display = "inline";
        }
        else
			{
			pagerHtml += '<br/><table><tr><td class="smallBike"><span id="pgPrev"></span><b>Aucun &eacute;v&eacute;nement pr&eacute;sent dans cette cat&eacute;gorie.<b><span id="pgNext" class="pg-normal-link"></span></td></tr></table>';
			if(document.getElementById('HeadIdeaDiv')!=null)
				document.getElementById('HeadIdeaDiv').style.display = "none";				
			}
        element.innerHTML = pagerHtml;
    }
}