var but=new Array();
but['b1']=new button(48,17,"img/a1.gif","img/b1.gif");
but['b2']=new button(98,17,"img/a2.gif","img/b2.gif");
but['b3']=new button(57,17,"img/a3.gif","img/b3.gif");
but['b4']=new button(66,17,"img/a4.gif","img/b4.gif");
but['b5']=new button(62,17,"img/a5.gif","img/b5.gif");
but['b6']=new button(64,17,"img/a6.gif","img/b6.gif");
but['b7']=new button(47,17,"img/a7.gif","img/b7.gif");
but['b8']=new button(64,17,"img/a8.gif","img/b8.gif");
but['b9']=new button(50,17,"img/a9.gif","img/b9.gif");
but['b10']=new button(97,17,"img/a10.gif","img/b10.gif");
but['b11']=new button(70,17,"img/a11.gif","img/b11.gif");


function button(wi,hi,img1,img2)
{this.offimg=new Image(hi,wi);
this.offimg.src=img1;
this.onimg=new Image(hi,wi);
this.onimg.src=img2;}
function on(name)
{document[name].src=but[name].onimg.src;}
function off(name)
{document[name].src=but[name].offimg.src;}