/* scripts for rollovers */

function preload(imgObj,imgSrc) {
   eval(imgObj+' = new Image()')
   eval(imgObj+'.src = "'+imgSrc+'"')
}


function img_toggle( imgName, mode ) {
   
   if( document.images ) {
      document[ imgName ].src = eval( imgName + "_" + mode + ".src" );
   }

}



/* script for popup window */

function showPopup( width, height, file) {
	x = (640 - width)/2, y = (480 - height)/2;

	if (screen) {
	y = (screen.availHeight - height)/2;
	x = (screen.availWidth - width)/2;
	}
	if (screen.availWidth > 1800) {
	x = ((screen.availWidth/2) - width)/2;
	}

   	var newWindow =

	window.open(file,'','width='+width+',height='+height+',screenX='+x+',screenY='+y+',top='+y+',left='+x+',scrollbars=yes,resizable=yes,toolbar=yes,menubar=yes,status=no');

}


/* script for form validation */

function validate() {
	theform = document.feedbackform;
	
	if(theform.first_name.value == ""){
		alert("Sorry, you forgot to fill in your First Name.");
		theform.first_name.focus();
		return false;
	}

	else if(theform.last_name.value == ""){
		alert("Sorry, you forgot to fill in your Last Name.");
		theform.last_name.focus();
		return false;
	}

	else if(theform.company.value == ""){
		alert("Sorry, you forgot to fill in your Company.");
		theform.company.focus();
		return false;
	}
	
	else if(theform.email.value == ""){
		alert("Sorry, you forgot to fill in your E-mail.");
		theform.email.focus();
		return false;
	}
	
	var emailID = theform.email;
		
	if (echeck(emailID.value) == false) {
		emailID.value=""
		emailID.focus();
		return false;
	}

	else {
		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;					
}