function highlight(who){
mince = who.src
tomato = mince.split('_')
bolognese = tomato[0]+'_over_'+tomato[1]
who.src = bolognese
}

function unhighlight(unwho){
cheese = unwho.src
bacon = cheese.split('_')
carbonara = bacon[0]+'_'+bacon[2]
unwho.src = carbonara
}