js marquee code (self-written)_javascript skills

function cls_marquee(id,id1,id2,sp){
this.obj_id=id;
this.obj_id1=id1;
this.obj_id2=id2;
this.speed=sp;
eval(this.obj_id2 ".innerHTML=" this.obj_id1 " .innerHTML");
function Marquee(){
if(eval(id2).offsetTop-eval(id).scrollTop<=0)
eval(id).scrollTop-=eval(id1) .offsetHeight
else{
eval(id).scrollTop
}
}
var MyMar=setInterval(Marquee,sp)
eval(this.obj_id).onmouseover=function( ) {clearInterval(MyMar)}
eval(this.obj_id).onmouseout=function() {MyMar=setInterval(Marquee,sp)}
}

< input id="Text1" type="text" value="Welcome to test" />