Accessing Iframes

function loadyahoo(){
//alert(window.frames['myFrame']);
window.document.frames['myFrame'].location = "test1.html";
alert(window.frames['myFrame'].document.all.nametxt.value);
window.frames['myFrame'].document.getElementById('nametxt').value="Jeetu is great!";
/*var iframeEl = document.getElementById('myFrame');
if ( iframeEl.contentDocument ) { // DOM
var form = iframeEl.contentDocument.getElementById('nametxt');
} else if ( iframeEl.contentWindow ) { // IE win
var form = iframeEl.contentWindow.document.getElementById('nametxt');
}*/
//form.value="jeetu alex";
//window.document.getElementById('myFrame').src = "test1.html";
//alert(document.getElementById('myFrame').contentWindow.document.getElementById('nametxt'));
//document.getElementById('myFrame').contentWindow.document.getElementById('nametxt').value="Jeetu";
}