var pr_norm = new Image();
var pr_act = new Image();
pr_norm.src="fileadmin/img/logo2-norm.gif";
pr_act.src="fileadmin/img/logo2-act.gif";

function prout()
{
document.logopr.src=pr_act.src;
}
function prin()
{
document.logopr.src=pr_norm.src;
}