function form1valid()

{

	if(document.form1.name.value == "")

	{	

		alert("Please Enter the Name");

		document.form1.name.focus();

		return false;

	}

	

	if(document.form1.address.value == "")

	{	

		alert("Please Enter the Address");

		document.form1.address.focus();

		return false;

	}

	
	
	if((document.form1.phone.value)=="")

	{

		alert("Please Enter the Contact No");

		document.form1.phone.focus();

		return false;

	}

	

	else 

	{

		if(isNaN(document.form1.phone.value))

		{

		alert("Please Enter Valid Contact No");

		document.form1.phone.focus();

		return false;

		}

		else

		{

		

		if(document.form1.phone.value.length < 10)

				{

				alert("Please Enter Valid Contact No");

				document.form1.phone.focus();

				return false;

				}

        }

	

	}

	if(echeck(document.form1.email.value)==false)

	{

		document.form1.email.focus();

		return false;

	}

	

}



function echeck(str) 

{



		var at="@"

		var dot="."

		var lat=str.indexOf(at)

		var lstr=str.length

		var ldot=str.indexOf(dot)

		if (str.indexOf(at)==-1)

		{

		   alert("Invalid E-mail ID")

		   return false

		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){

		   alert("Invalid E-mail ID")

		   return false

		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){

		    alert("Invalid E-mail ID")

		    return false

		}

		 if (str.indexOf(at,(lat+1))!=-1){

		    alert("Invalid E-mail ID")

		    return false0

		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){

		    alert("Invalid E-mail ID")

		    return false

		 }

		 if (str.indexOf(dot,(lat+2))==-1){

		    alert("Invalid E-mail ID")

		    return false

		 }		

		 if (str.indexOf(" ")!=-1){

		    alert("Invalid E-mail ID")

		    return false

		 }

 		 return true

}