// JavaScript Document
 function validate() {
	    tname=document.form1.txtNa.value;
		tph=document.form1.txtPh.value;
		tem=document.form1.txtEm.value;
		var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
		
		if(tname=="" && tph=="" && tem=="")
		{
		  alert("you have not completed the required fields");
		  event.returnValue=false;
		}
		else if(tname=="" && tph=="") {
		 alert("Please enter your name and phone number"); 
		 //msg+="please enter your name"
		 event.returnValue=false;
		 }
		 else if(tname=="" && tem=="") {
		 alert("Please enter your name and email address");
		 //msg+="please enter your phone number"
		 event.returnValue=false;
		 }
		 else if(tph=="" && tem=="") {
		 alert("Please enter your phone number and email address");
		 //msg+="please enter your phone number"
		 event.returnValue=false;
		 }
		 else if(tname=="") {
		   alert("Please enter your name");
		 //msg+="please enter your phone number"
		 event.returnValue=false;
		 }
		 else if(tph=="") {
		 alert("Please enter your phone number");
		 //msg+="please enter your phone number"
		 event.returnValue=false;
		 }
		 else if(tem=="") {
		 alert("please enter the email id");
		 event.returnValue=false;
		 }
		 else if(!tem.match(re)) {
		  alert("invalid Email ID");
		  event.returnValue=false;
		 } 
		 else if(tph.search(/\d{3}\-\d{3}\-\d{4}/)==-1)
        {
          alert("The phone number you entered is not valid.\r\nPlease enter a phone number with the format xxx-xxx-xxxx.");
          event.returnValue=false;
      }

 }