这段jsp代码如何转换为PHP代码

<code>var primgs=document.getElementById(primg[curentico]);
var prtxts=document.getElementById(prtxt[curentico]);
primgs.className="iB";
prtxts.className="";
}
</code>

<code>cleartab();
var pathimg="im/"+im+".jpg";
document.Mailcard.imgBox.src=pathimg;
var primgs=document.getElementById(primg[id]);
var prtxts=document.getElementById(prtxt[id]);
primgs.className="iBF";
prtxts.className="tBF";
document.Mailcard.cardImg.value=pathimg;
curentico=id;
}
</code>

<code>if(document.Mailcard.toEmail.value==""){
    alert("璇峰～</code>