var i=0;
var classes = new Array ("picsele", "picselezwo", "picseledrei");

function picchangeplu() {
i=i+1;
if (i>=3){i=0;}
identity=document.getElementById("pics");
identity.className=classes[i];

}

function picchangemin() {
i=i-1;
if (i<=-1){i=2;}
identity=document.getElementById("pics");
identity.className=classes[i];

}