var myDialog = new Object;

function getDate(inp) {
    myDialog.str = "y";
    myDialog.start = inp.value;
    myDialog.msg = "Piad On";
 result=showModalDialog("calander.htm", myDialog,"dialogHeight: 210px; dialogWidth:216px;scroll:no;help:no;status:no")
    if (result==false) {
  inp.value = ""
        return;    // user canceled search
       }
    else {
  inp.value =myDialog.start
    }
}