a1=new Image();
a1.src="img/m_01.gif";
a2=new Image();
a2.src="img/m_01_a.gif";
b1=new Image();
b1.src="img/m_02.gif";
b2=new Image();
b2.src="img/m_02_a.gif";
c1=new Image();
c1.src="img/m_03.gif";
c2=new Image();
c2.src="img/m_03_a.gif";
d1=new Image();
d1.src="img/m_04.gif";
d2=new Image();
d2.src="img/m_04_a.gif";

e1=new Image();
e1.src="img/catalog_s.jpg";
e2=new Image();
e2.src="img/catalog_s_a.jpg";

function filter(imagename,objectsrc){
	document[imagename].src=eval(objectsrc+".src");
}