Checking the Form with Help of JS Script

function Blank_TextField_Validator()
	{
	//get the referece for form name text_formCheck the value of the element named text_name
	// from the form named text_form
	var x=document.getElementById("text_form");
	for(var i=0;i<=5;i++)
	{
	if(i==2){
	i=3;
	}
	if(x.elements[i].value=="")
	{
	// If null display and alert box
	alert("Please fill in the text field.");
	// Place the cursor on the field for revision
	x.elements[i].focus();
	//return false to stop further processing
	return (false);
	}
	}//end loop
	// If text_name is not null continue processing
	return (true);
	}
	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 false
	}
	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
	}