function MM_findObj(n, d) { //v4.0
   var p,i,x;   if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
     d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
   if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
   for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
   if(!x && document.getElementById) x=document.getElementById(n); return x;
}
function JM_cc(ob){
var obj=MM_findObj(ob); if (obj) { 
obj.select();js=obj.createTextRange();js.execCommand("Copy");}
alert("Copy completed!");
}

document.write('<input name="page_url" value="'+window.location.href+'" size="45"> <input type="button" name="Button" class="button1" value="Copy" onClick=JM_cc("page_url")><br>');