coded = "<i7EuP7E5j>vI<TVOuiT>u.v57"
codedlt = "<i7EuP7E5j>vI<TVOuiT>u.v57"

key = "MVQrsAaP@gh67wyRFqodl0v4DBbxXj<9>1IOEeUJcCKpi8uZGHztTk2mWLYN3nS5f"

//watching namespace pollution here
var decfn = function(str){ 
	var shift=str.length
	var plain=""
	for (i=0; i<str.length; i++){
		if (key.indexOf(str.charAt(i))==-1){
			ltr=str.charAt(i)
			plain+=(ltr)
		} else {
			ltr = (key.indexOf(str.charAt(i))-shift+key.length) % key.length
			plain+=(key.charAt(ltr))
		}
	}
	return plain;
}
document.write("<a href='mailto:"+decfn(coded)+"'>"+decfn(codedlt)+"</a>")