function changeTab(id){
	
	
    var trg = $('pictures')
	url = 'get_kepek.php';
		pars = 'dir='+id;
	    var myAjax = new Ajax.Updater(
		    trg, 
		    url, 
		    {	
			    method: 'post',				 
			    parameters: pars,
			    
			onCreate: function(transport) {
      				// yada yada yada
      				$('pictures').fade({duration: 0.5});
  			},
  			
			onSuccess: function(transport) {
      				// yada yada yada
      				$('pictures').appear({duration: 0.5});
  			}  			
			  			    
			    
		    }
			
			);		
	
}

function showAdv(){
     var arrayPageSize = getPageSize();
        $('AdvOvr').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px'});
        new Effect.Opacity('AdvOvr', { from: 0.0, to: 0.7, duration: 0.0 });    
        $('AdvImg').setStyle({ left: (arrayPageSize[0]-800)/2 + 'px', top: (arrayPageSize[1]-490)/2 + 'px'});
        
}

function  getPageSize() {
	        
	     var xScroll, yScroll;
		
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		
		if (self.innerHeight) {	// all except Explorer
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
	
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = xScroll;		
		} else {
			pageWidth = windowWidth;
		}
        
		return [pageWidth,pageHeight];
	}