function swapCondition(convalue,sbutton) {
	if(convalue == "AND")
	{
	sbutton.value = "OR";
	}
	else
	{
	sbutton.value = "AND";
	}
}
function keywordSearch(frmelement, conditionval) {
	keywordsb = frmelement.value;
	if(keywordsb.indexOf(" ") != -1 && conditionval == "AND")
	{
	keywordsarray = keywordsb.split(" ");
	keywordsb = "";
		for(pos=0;pos<keywordsarray.length;pos++)
		{
			if(pos == keywordsarray.length -1)
			{
			keywordsb += " " + keywordsarray[pos];
			}
			else
			{
			keywordsb += keywordsarray[pos] + " " + conditionval;
			}
		}
	
	frmelement.value = keywordsb;
	}
}
function clearList(eleval, letter) {
for(j=0;j<eleval.options.length;j++)
	{
	eleval.options[j] = null;
	}
	eleval.options[0] = new Option("Please select from " + letter + "'s");
	eleval.length = 1;
}
function addEntry(entry, eleval) {
eleval.options[eleval.options.length] = new Option(entry,entry);
}
function chooseLetter(letter,formval) {
eleval = formval.keywordlist;
clearList(eleval, letter); 
load_data();
	for(k=0;k<Full_data.length;k++)
	{
	currentkeyword = Full_data[k];
	currentletter = currentkeyword.charAt(0);
		if(currentletter.toUpperCase() == letter.toUpperCase())
		{
		currentkeyword = currentkeyword.toLowerCase();
		currentkeyword = currentkeyword.split("_");
		for(var j=0;j<currentkeyword.length;j++) {
			currentkeyword[j] = currentkeyword[j].charAt(0).toUpperCase() + currentkeyword[j].substr(1);
		}
		addEntry(currentkeyword.join("_"), eleval);
		}
	}

}
function replaceChars(entry, out, add) {
temp = "" + entry;

while (temp.indexOf(out)>-1) {
pos= temp.indexOf(out);
temp = "" + (temp.substring(0, pos) + add + 
temp.substring((pos + out.length), temp.length));
}
return(temp);
}

function addKeyword(condition, keyword, keywordbox) {
keyword = replaceChars(keyword, "'", "#");
keyword = replaceChars(keyword, "#", "\\'");
if(condition != "OR")
{
keyval = keywordbox.value;
	if(keyval.length == 0)
	{
	keywordbox.value = keyword;
	}
	else
	{
	keywordbox.value = keywordbox.value + " " + condition + " " + keyword;
	}
}
else
{
keyval = keywordbox.value;
	if(keyval.length == 0)
	{
	keywordbox.value = keyword;
	}
	else
	{
	keywordbox.value = keywordbox.value + " " + keyword;
	}
}

}
function zoomImage(image) {

var w = 800, h = 600, cw = w/2, ch = h/2;

if (window.screen) {
    w = Math.floor(screen.availWidth/3);
    h = Math.floor(screen.availHeight/3);
}

nw=window.open('http://www.picturesheffield.co.uk/cgi-bin/zoom.pl?picture='+image,'zoomwin',"width='+w+',height='+h+',resizable=1,scrollbars=yes");
nw.focus();
}
function replaceKeywords() {
keywordsb = document.info.keywordsb.value;
keywordsb = replaceChars(keywordsb, "(*)", "");
keywordsb = replaceChars(keywordsb, "($)", "");
document.info.keywordsb.value = keywordsb;
}