// JavaScript Document
window.onload=function() {
	var forms = document.getElementsByTagName('form');
	for (i=0;i<forms.length;i++) {//Loop through all forms in the page
		if (forms[i].className == "auto_validate") {
			var inputs = forms[i].getElementsByTagName('input');
			for (j=0;j<inputs.length;j++) {//Loop through input-fields in a form				
				if (inputs[j].className == "req_text") {//required field
					var req_img = document.createElement('img');//Create image to mark the required field
					req_img.src="media/required.gif";
					req_img.className="form";
					req_img.alt="Required_field";
					inputs[j].parentNode.insertBefore(req_img, inputs[j]);//Insert it before the field
					inputs[j].onblur=function() {//
						if (trim(this.value) == "") {
							this.previousSibling.src="media/invalid.gif";
							this.style.border="1px solid #f00";
						}
						else {
							this.previousSibling.src="media/valid.gif";
							this.style.border="1px solid #aaa";
						}
					}
				}
				else if (inputs[j].className == "req_email") {
					var req_img = document.createElement('img');
					req_img.src="media/required.gif";
					req_img.className="form";
					req_img.alt="Required_field";
					inputs[j].parentNode.insertBefore(req_img, inputs[j]);
					inputs[j].onblur=function() {
						if (trim(this.value) == "" || !echeck(this.value)) {
							this.previousSibling.src="media/invalid.gif";
							this.style.border="1px solid #f00";
						}
						else {
							this.previousSibling.src="media/valid.gif";
							this.style.border="1px solid #aaa";
						}
					}
				}				
			}
		}
	}
	if (document.images) {
		pic1= new Image(20,20); 
		pic1.src="valid.gif"; 

		pic2= new Image(20,20); 
		pic2.src="invalid.gif";
	}
}

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					
}


function trim(str) {
	return str.replace(/^\s+|\s+$/g, '');
}