function preloader() 

{


     // counter
     var i = 0;


     // create object
     imageObj = new Image();


     // set image list
     images = new Array();
     images[0]="images/about_btn_over.jpg"
     images[1]="images/agenda_btn_over.jpg"
     images[2]="images/feedback_btn_over.jpg"
     images[3]="images/home_btn_over.jpg"


     // start preloading
     for(i=0; i<=3; i++) 
     {
          imageObj.src=images[i];
     }



}

function downloadSwap(obj){
	if(obj.src.search(/_over\.jpg/) <= 0 && obj.src.search(/_down\.jpg/) <= 0){
		obj.src = obj.src.replace(".jpg", "_over.jpg");
	}else{
		obj.src = obj.src.replace("_over.jpg", ".jpg");
	}
}