function w_open(w_link,w_w,w_h)
		{
		var w_left = Math.ceil((screen.width - w_w ) / 2);				
			w_top = Math.ceil((screen.height - w_h ) / 2);
							
		window.open(w_link,"w_popup","width="+w_w+",height="+w_h+",scrollbars=no,left="+w_left+",top="+w_top);
		}
					
	function w_full_open(w_link)
		{							
		window.open(w_link,"w_popup","width="+screen.width+",height="+screen.height+",scrollbars=1,toolbar=1,location=1,status=1,menubar=1,resizable=1,left=0,top=0");
		}	
	
	function show(id)
		{
		document.getElementById(id).style.display='block';	
		}
		
	function hide(id)
		{
		document.getElementById(id).style.display='none';			
		}
		
	function show_hide(id)
		{			
		if (document.getElementById(id).style.display == 'block')
			{
			document.getElementById(id).style.display='none';	
			}
		else
			{
			document.getElementById(id).style.display ='block';	
			}
		}