function doForms(){
	var formObjects = document.getElementsByTagName( 'form' );
	
	for ( var i = 0; i < formObjects.length; i++ ) {
		var formObject = formObjects[ i ];
		
		if ( formObject.getAttribute( "class" ) == 'external' ){
			formObject.target = "_blank";
		}
	}
}

window.onload = function(){
	doForms();
}