var a=new Array()
for(i=0;i<14;i++){
a[i]=new Image();
}
a[0].src="ima/library_button_01.gif";
a[1].src="ima/library_button_01a.gif";
a[2].src="ima/library_button_02.gif";
a[3].src="ima/library_button_02a.gif";
a[4].src="ima/library_button_03.gif";
a[5].src="ima/library_button_03a.gif";
a[6].src="ima/library_button_04.gif";
a[7].src="ima/library_button_04a.gif";
a[8].src="ima/library_button_05.gif";
a[9].src="ima/library_button_05a.gif";
a[10].src="ima/library_button_06.gif";
a[11].src="ima/library_button_06a.gif";
a[12].src="ima/library_button_07.gif";
a[13].src="ima/library_button_07a.gif";

function paintBtn(aa,bb){
document.images[aa].src=a[bb].src;
}