function tbcopy() {
var tb=document.tbform.tbt;
tb.focus();
tb.select();
therange=tb.createTextRange();
therange.execCommand("Copy");
}

uaBlog = new Object();
getuaBlog();

function getuaBlog(){
	var uBlog = navigator.userAgent.toLowerCase();
	if ( uBlog.match( /msie/ ) ) uaBlog.ie = true;
}
function copyField(field) {
	if(uaBlog.ie){
		document.write("<input type='button' value='URLをコピー' onclick='tbcopy()' style='font-size:90%;' />");
	}
}