// JavaScript Document

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 validate_form () {
	
    valid = true;
	
	var emailID=document.contact_form.email
	
    if ( document.contact_form.name.value == "" ) {
        alert ( "Please fill in the 'Contact Person'." );
		document.contact_form.name.focus();
        valid = false;
    } else if ( document.contact_form.company.value == "" ) {
        alert ( "Please fill in the 'Company Name'." );
		document.contact_form.company.focus();
        valid = false;
    } else if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	} else if (echeck(emailID.value)==false){
		emailID.focus()
		return false
	}
	else if ( document.contact_form.message.value == "" ) {
        alert ( "Please Type your message." );
		document.contact_form.message.focus();
        valid = false;
	} else if ( document.contact_form.cap.value != document.contact_form.captcha_phrase.value ) {
        alert ( "Please fill correct captcha text in the field." );
		document.contact_form.captcha_phrase.focus();
        valid = false;
    }

    return valid;
	
}


function captcha() {
	
		var string='';
		var i;
		var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmno  pqrstuvwxyz";
		var ran_unrounded;
		var ran_number;
		var rnum;
		cap = '';
		for(i=0;i<5;i++) {   
			rnum= Math.floor(Math.random() * chars.length);
			string += chars.substring(rnum,rnum+1);
			ran_unrounded=Math.random()*3;
			ran_number=Math.floor(ran_unrounded);
			cap += chars.substring(rnum,rnum+1);
		}
		
		document.write(cap);
		document.write("<input type='hidden' name='cap' type='hidden' value='"+cap+"'>");
		
}