// <input type=text>
function setText(obj, value)
{
		obj.value = value;
}

// <input type=checkbox>
function setCheckBox(obj, value)
{
	if(obj.value == value) 
		obj.checked = true;
}

// <select>
function setSelect(obj, value, byValue)
{
		for(var i=0; i<obj.options.length; i++) {		
				if((byValue && obj.options[i].value == value) || (!byValue && obj.options[i].text == value))
						obj.selectedIndex = i;
		}
}

// <input type=radio>
function setRadio(obj, value)
{
		if(obj.value == value)
				obj.checked = true;
}

// <textarea>
function setTextArea(obj, value)
{
		obj.value = value;
}

// split date param and set all the input fields
function setDate(name, value)
{
		var parts = value.split("-");
		if(parseInt(parts[2]))
				setValue(name, parseInt(parts[2]));
		if(parseInt(parts[1]))
				setValue(name, parseInt(parts[1]), 1);
		setValue(name, parts[0]);
}

// find element with the given name and set its value
function setValue(name, value, byValue)
{
		var col = document.getElementsByName(name);
		if(col.length) {
				for(var i=0; i<col.length; i++) {
					
						if(col[i].tagName == 'INPUT') {
								if(col[i].type == 'text' || col[i].type == 'hidden' || col[i].type == 'password')
										setText(col[i], value);
								else if(col[i].type == 'checkbox')
										setCheckBox(col[i], value);
								else if(col[i].type == 'radio')
										setRadio(col[i], value);
						} else if(col[i].tagName == 'SELECT') {
								setSelect(col[i], value, byValue);
						} else if(col[i].tagName == 'TEXTAREA') {
								setTextArea(col[i], value);
						}
						
				}
		}
}

// remove leading and trailing spaces
function ltrim(s)
{
		if(!s) return '';
		return s.replace(/^\s*/, "");
}

function rtrim(s)
{
		if(!s) return '';
		return s.replace(/\s*$/, "");
}

function trim(s)
{
		return rtrim(ltrim(s));
}

// php's urlencode replaces spaces with "+"... the javascript's unescape doesn't decode it back
function urldecode(str)
{
		if(!str) return '';		
		return unescape(str.replace(/\+/g, ' '));		
}

// add this function to the body onLoad event handler to prefill all the elements with the given params
function preFill(utf8)
{
		var url = document.URL;	
		
		var url_parts = url.split("?");
		
		if(url_parts.length == 2) {
			
				var search = url_parts[1];
				
				var params = search.split("&");
				
				for(var i=0; i<params.length;i++) {
						var param = params[i].split("=");
						var name = trim(urldecode(param[0]));
						var value = utf8 ? trim(decodeURIComponent(param[1].replace(/\+/g, '%20'))) : trim(urldecode(param[1])); 
						var elm;
						var tmp;
						
						if(dateFields[name]) {
								setDate(name, value);
						} else if(multiFields[name]) {
							eval("elm=arr_"+multiFields[name]+";");
							for(tmp in elm) {
								if(value.indexOf(tmp) > -1) {
									setValue(name, elm[tmp]);									
									value = value.substr(0,value.indexOf(tmp))+value.substr(value.indexOf(tmp)+tmp.length,value.length);									
								}
							}
						}
						else
								// finaly, set the standard params
								setValue(name, value, 0);
				}
		}
}