function page(prevImg_id,nextImg_id,amount)
{
	this.amount=amount;
	this.cur_page=1;
	this.prevImg=document.getElementById(prevImg_id);
	this.nextImg=document.getElementById(nextImg_id);
	this.num_row=0;
	
	this.getPrevPage=function()
	{
		this.cur_page--;
		
		if(this.cur_page==1)
			this.prevImg.style.visibility='hidden';
		else
			this.prevImg.style.visibility='visible';
			
		if(this.num_row-this.amount*(this.cur_page)>0)
			this.nextImg.style.visibility='visible';
			
		return this.cur_page;
	}
	
	this.getNextPage=function()
	{
		this.cur_page++;
		
		if(this.cur_page<=1)
			this.prevImg.style.visibility='hidden';
		else
			this.prevImg.style.visibility='visible';
		

		if(this.num_row-this.amount*(this.cur_page-1)<=amount)
			this.nextImg.style.visibility='hidden';
		else
			this.nextImg.style.visibility='visible';
			
		return this.cur_page;
	}
	
	this.imgInitialize=function()
	{
		this.nextImg.style.visibility='hidden';
		this.prevImg.style.visibility='hidden';
		if(this.num_row-this.amount*(this.cur_page)>0)
			this.nextImg.style.visibility='visible';
	}
	
	this.pageInitialize=function()
	{
		this.cur_page=1;
	}
	
	this.createCounter=function(id,cname)
	{
		var img;
		obj=document.getElementById(id);
		this.total_page=Math.ceil(this.num_row/this.amount);
		
		obj.innerHTML='';
		
		for(var i=0; i<this.total_page;i++)
		{
			var img=document.createElement('img');
			img.className=cname;
			img.src='./images/dot.gif';
			obj.appendChild(img);
		}
	}
	
	this.moveCounter=function(cname)
	{	
		var obj = getElementsByClassName('img',cname);
		
		for(var i=0;i<obj.length;i++)
		{
			if(this.cur_page-1==i)
				obj[i].src='./images/'+cname+'_c.gif';
			else
				obj[i].src='./images/'+cname+'.gif';
		}
	}
}