$().ready(function() {
    $("img.a").hover(
     function()
     {
       this.src = this.src.replace("/images/ospmember1.gif","/images/ospmember2.gif");
     },
     function()
     {
       this.src = this.src.replace("/images/ospmember2.gif","/images/ospmember1.gif");
     });
    $("img.b").hover(
     function()
     {
       this.src = this.src.replace("/images/arma1.png","/images/arma2.png");
     },
     function()
     {
       this.src = this.src.replace("/images/arma2.png","/images/arma1.png");
     });         
});