function chkData(f)
{
	var em_check=echeck(f.txtEmail.value);
	if(em_check!=true )
	{
		alert("Invalid E-mail ID.");
		f.txtEmail.focus();
		return false;
	}
	if(f.txtFirstName.value=="")
	{
		alert("Please enter First Name.");
		f.txtFirstName.focus();
		return false;
	}
	if(f.txtLastName.value=="")
	{
		alert("Please enter Last Name.");
		f.txtLastName.focus();
		return false;
	}
	// var ph_check=pcheck(f.txtPhone.value);
	if(fcheck(f.txtWorkPhone.value, 3) != true || fcheck(f.txtWorkPhone2.value, 3) != true || fcheck(f.txtWorkPhone3.value, 4) != true)
	{
		alert("Invalid Work Phone number.");
		f.txtWorkPhone.focus();
		return false;
	}
	// var ph_check=pcheck(f.txtCellPhone.value);
	if(fcheck(f.txtCellPhone.value, 3) != true || fcheck(f.txtCellPhone2.value, 3) != true || fcheck(f.txtCellPhone3.value, 4) != true)
	{
		alert("Invalid Cell Phone number.");
		f.txtCellPhone.focus();
		return false;
	}
}
//Checking the validity of phone
function pcheck(str)
{
	var ValidChars = "0123456789";
	var IsNumber=true;
	var Char;
	if(str.length>=10 && str.length<=11) 
	{
   		for (i = 0; i < str.length && IsNumber == true; i++) 
    	{ 
    	Char = str.charAt(i); 
      		if (ValidChars.indexOf(Char) == -1) 
        	{
        	IsNumber = false;
        	}
      	}
	}
	else
	{
	IsNumber = false;
	}
	return IsNumber;
}

function fcheck(str, len)
{
	var ValidChars = "0123456789";
	var IsNumber = true;
	var Char;
	if(str.length == len) 
	{
   		for (i = 0; i < str.length && IsNumber == true; i++) 
    		{ 
    			Char = str.charAt(i); 
			if (ValidChars.indexOf(Char) == -1) 
			{
				IsNumber = false;
			}
      		}
	}
	else
	{
		IsNumber = false;
	}
	return IsNumber;
}

//Checking the validity of email
function echeck(str) 
{
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	if (str.length == 0) {
		return false;
	}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr-1)
	{
		return false;
	}
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr-1)
	{
    		return false;
	}
	if (str.indexOf(at,(lat+1))!=-1)
	{
		return false;
	}
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
	{
		return false;
	}
	if (str.indexOf(dot,(lat+2))==-1)
	{
	return false;
	}
	if (str.indexOf(" ")!=-1)
	{
		return false;
	}
return true;					
}