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//     re-source - Tilman Reiff Interaction Design 
//
// ===================================================
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//     re-view - cool online source for design links
//     © Tilman Reiff 11/1999 <tilman@re-source.com>
//
// ===================================================


function evaluateData() {
	var myForm = document.re_form;
	var techmax = 0;
	visual_max = 21;
	var lastprop = "0";
	techlevel = 1;
	keywordstring = "";
	visual_load = 0;
	image_load = readRadio(myForm.visuals);
	typo_load = readRadio(myForm.typo);
	org_load = readRadio(myForm.org);
	dwnl_speed = readRadio(myForm.dspeed);
	
	
	// add author to keywords
	keywordstring += myForm.linkauthor.value;
	
	// read checkboxes
	for (i=0; i<myForm.elements.length; i++) {
		
		if ( (myForm.elements[i].type == "checkbox") && (myForm.elements[i].name != lastprop)) {
			var myFloat = parseFloat( myForm.elements[i].value);
			
			if (myForm.elements[i].name.indexOf('key') == -1)
				techmax += ( ( myFloat > 0) ? myFloat : 0 );
			
			if ( (myForm.elements[i].checked) ) {
				if (myForm.elements[i].name.indexOf('key') == -1) {
					techlevel += myFloat;
					keywordstring += " " + myForm.elements[i].name;
				} else {
					keywordstring += " " + myForm.elements[i].value;
				}
				lastprop = myForm.elements[i].name;
			}
		}
	}
	
	// calculate techlevel
	//alert(techmax);
	techlevel = ( (techlevel) / (techmax*relativator) ) * 10;
	techlevel += dwnl_speed;
	
	
	// calculate visual load
	visual_load += image_load + typo_load + org_load;
	visual_load = (visual_load/visual_max)*10;
	visual_load += (dwnl_speed*0.33);
	
	// write data to form fields
	myForm.linktech.value = truncate(techlevel);
	myForm.linkstyle.value = truncate(visual_load);
	myForm.linkkeywds.value = keywordstring;
	
	//alert(readRadio(myForm.visuals));
	//alert( myForm.linktech.value + ' ' + myForm.linkstyle.value + ' \n' + keywordstring + ' \n' + techmax + ' ' + relativator);
	
}

function readRadio(whichRadioGrp) {
	var myRadioGrp = whichRadioGrp;
	var returnval = 0;
	
	for (r=0; r<whichRadioGrp.length; r++) {
		if (whichRadioGrp[r].checked) {
			returnval = whichRadioGrp[r].value;
			break;
		} 
	}
	return parseFloat(returnval);
}

function truncate(whichFloat) {
	var myFloat = whichFloat;
	var myString = new String()
	
	myFloat = (myFloat<=10?myFloat:10);
	myString = myFloat.toString();
	if (myString.length > 4) {
		myString= myString.substring(0, 4);
	}
	return myString;
}

function imageChange(imgName, state) {
	if (document.images) {
		var myImg = imgName + '_' + state;
		document.images[imgName].src = eval(myImg + ".src");
	}
}