if (document.images) { 
r1= new Image(112,25); 
r1.src="images/nav_writers_off.gif"; 
r2= new Image(112,18); 
r2.src="images/nav_portfolio_off.gif"; 
r3= new Image(112,31);
r3.src="images/nav_contactus_off.gif"; 

//

rr1= new Image(112,25); 
rr1.src="images/nav_writers_on.gif"; 
rr2= new Image(112,18); 
rr2.src="images/nav_portfolio_on.gif"; 
rr3= new Image(112,31);
rr3.src="images/nav_contactus_on.gif"; 
}


function changeImage(row,s) {

var h;

h= (s==1)? "r":"";

if (document.images) {

document.images[row].src = eval(h+row + ".src");

}

}