if (document.images) {

 img1_on =new Image(); img1_on.src ="images/general/grass_marker.gif"; 
 img1_off=new Image(); img1_off.src="images/general/marker.gif"; 

 img2_on =new Image(); img2_on.src ="images/general/grass_marker.gif"; 
 img2_off=new Image(); img2_off.src="images/general/marker.gif"; 

 img3_on =new Image(); img3_on.src ="images/general/grass_marker.gif"; 
 img3_off=new Image(); img3_off.src="images/general/marker.gif"; 

 img4_on =new Image(); img4_on.src ="images/general/grass_marker.gif"; 
 img4_off=new Image(); img4_off.src="images/general/marker.gif"; 

 img5_on =new Image(); img5_on.src ="images/general/grass_marker.gif"; 
 img5_off=new Image(); img5_off.src="images/general/marker.gif"; 
 
 img6_on =new Image(); img6_on.src ="images/general/grass_marker.gif"; 
 img6_off=new Image(); img6_off.src="images/general/marker.gif";  
 
 img10_on =new Image(); img10_on.src ="images/home/icon_eastern_fade.gif"; 
 img10_off=new Image(); img10_off.src="images/home/icon_eastern.gif";  
 
 img11_on =new Image(); img11_on.src ="images/home/icon_western_fade.gif"; 
 img11_off=new Image(); img11_off.src="images/home/icon_western.gif";  
 
 img12_on =new Image(); img12_on.src ="images/home/icon_rocky_fade.gif"; 
 img12_off=new Image(); img12_off.src="images/home/icon_rocky.gif";  
 
 img13_on =new Image(); img13_on.src ="images/home/icon_all_fade.gif"; 
 img13_off=new Image(); img13_off.src="images/home/icon_all.gif";  

}

function movr(k) {
 if (document.images) 
  eval('document.img'+k+'.src=img'+k+'_on.src');
}

function mout(k) {
 if (document.images) 
  eval('document.img'+k+'.src=img'+k+'_off.src');
}