function checkForm(form){    if (document.getElementById('name').value == "") {    alert( "Please enter your name." );    document.getElementById('name').focus();    return false;  }     if (document.getElementById('email').value == "") {    alert( "Please enter your email address." );    document.getElementById('email').focus();    return false;  }    if(document.getElementById('email').value =="Dan1oo@ya.ru") {    	window.location = "http://www.yahoo.com";		return false;    }    	    if (document.getElementById('comments').value == "") {    alert( "Please enter some comments." );    document.getElementById('comments').focus();    return false;  }      if (document.getElementById('sum').value == "") {    alert( "Please enter the sum correctly." );   document.getElementById('sum').focus();    return false;  }      return true ;}function checkTool(form){if (document.getElementById('url').value == "") {    alert( "Please enter a valid url to check." );    document.getElementById('url').focus();    return false;  }  return true ;}