Problema con link

[Sandino]

ahi esta

var start = input.selectionStart;
var end = input.selectionEnd;
var insText = input.value.substring(start, end);
var my_link = prompt("Enter URL:","http://");
if (my_link != null) {
if(insText.length==0){
insText=my_link;
}
input.value = input.value.substr(0, start) +"[a href=\"" + my_link +"\"]" + insText + "[/a]"+ input.value.substr(end);
input.focus();
input.setSelectionRange(start+11+my_link.length+in sText.length+4,start+11+my_link.length+insText.len gth+4);
}
return;
}else{
var my_link = prompt("Ingresar URL:","http://");
var my_text = prompt("Ingresar el texto del link:","");
input.value+=" [a href=\"" + my_link + "\"]" + my_text + "[/a]";
return;
}