var Ptr=document.getElementsByTagName("tr");
function recolor() {
for (i=1;i<Ptr.length+1;i++) {
Ptr[i-1].className = (i%2>0)?"t1":"t2";
}
}
window.onload=recolor;
for(var i=0;i<Ptr.length;i++) {
Ptr[i].onmouseover=function(){
this.tmpClass=this.className;
this.className = "t3";
};
Ptr[i].onmouseout=function(){
this.className=this.tmpClass;
};
}