var browserOK=true; 

if(browserOK) {
link_1_on=new Image();
link_1_off=new Image();
link_2_on=new Image();
link_2_off=new Image();
link_3_on=new Image();
link_3_off=new Image();
link_4_on=new Image();
link_4_off=new Image();
link_5_on=new Image();
link_5_off=new Image();
link_6_on=new Image();
link_6_off=new Image();

link_1_on.src="images/links_01.gif";
link_1_off.src="images/links_00.gif"; 
link_2_on.src="images/links_02.gif";
link_2_off.src="images/links_00.gif"; 
link_3_on.src="images/links_03.gif";
link_3_off.src="images/links_00.gif";
link_4_on.src="images/links_04.gif";
link_4_off.src="images/links_00.gif";
link_5_on.src="images/links_05.gif";
link_5_off.src="images/links_00.gif";
link_6_on.src="images/links_06.gif";
link_6_off.src="images/links_00.gif";
}