function changeimg(img_name, img_src, link_name, link_value)
   {
   document[img_name].src = img_src;
   document.getElementById(link_name).href=link_value;
   }

// preload a couple of images
pic1= new Image(90,90); 
pic1.src="images/button_ask_kristine.gif"; 

pic2= new Image(90,90); 
pic2.src="images/button_join_kristine.gif";

pic3= new Image(90,90); 
pic3.src="images/button_meet_kristine.gif";

pic4= new Image(90,90); 
pic4.src="images/button_support_kristine.gif";

pic5= new Image(324,90); 
pic5.src="images/blue_box_ask.gif";

pic6= new Image(324,90); 
pic6.src="images/blue_box_join.gif";

pic7= new Image(324,90); 
pic7.src="images/blue_box_meet.gif";

pic8= new Image(324,90); 
pic8.src="images/blue_box_support.gif";