Validate the contorl in java script

function Validate()
{
if (document.getElementById("Name").value == "") //"Name" == it is a control Id
{
alert("Please enter name");
return false;
}

if (document.getElementById("address").value == "")
{
alert("Please enter Address");
return false;
}
if (document.getElementById("contactno").value == "")
{
alert("Please enter contact no");
return false;
}
if (document.getElementById("query").value == "")
{
alert("Please enter Query");
return false;
}
return true;

}