function roll_on(obj,name)
{
	roll_on_ext(obj,name,'jpg');
}

function roll_on_ext(obj,name,ext)
{
	obj.src='/skin/images/'+name+'_over.'+ext;
}


function roll_off(obj,name)
{
	roll_off_ext(obj,name,'jpg');
}

function roll_off_ext(obj,name,ext)
{
	obj.src='/skin/images/'+name+'_off.'+ext;
}