bt1= new Image(132,20); 
bt1.src="/homeBtOn.gif"; 


bt2= new Image(132,20); 
bt2.src="/mudaBtOn.gif"; 


bt3= new Image(132,20); 
bt3.src="/guarBtOn.gif"; 

bt4= new Image(132,20); 
bt4.src="/transBtOn.gif"; 

bt5= new Image(132,20); 
bt5.src="/icamBtOn.gif"; 

bt6= new Image(132,20); 
bt6.src="/contBtOn.gif";