firsta1=new Image()
firsta1.src="pics/bg_pic_gal_1_equip_a.jpg"
seconda1=new Image()
seconda1.src="pics/bg_pic_gal_1_equip_b.jpg"

firstb1=new Image()
firstb1.src="pics/bg_pic_gal_2_friends_a.jpg"
secondb1=new Image()
secondb1.src="pics/bg_pic_gal_2_friends_b.jpg"

firstc1=new Image()
firstc1.src="pics/bg_pic_gal_3_roadcrew_a.jpg"
secondc1=new Image()
secondc1.src="pics/bg_pic_gal_3_roadcrew_b.jpg"

firste1=new Image()
firste1.src="pics/bg_pic_gal_5_lightcrew_a.jpg"
seconde1=new Image()
seconde1.src="pics/bg_pic_gal_5_lightcrew_b.jpg"

firstf1=new Image()
firstf1.src="pics/bg_pic_gal_6_group_a.jpg"
secondf1=new Image()
secondf1.src="pics/bg_pic_gal_6_group_b.jpg"

firstg1=new Image()
firstg1.src="pics/bg_pic_gal_7_artnsnd_a.jpg"
secondg1=new Image()
secondg1.src="pics/bg_pic_gal_7_artnsnd_b.jpg"

function filterpics(imagename,objectsrc)
{
if (document.images)
document.images[imagename].src=eval(objectsrc+".src")
}