function insertAtCursor(myField, myValue) {
//IE support
if (document.selection) {
myField.focus();
sel = document.selection.createRange();
sel.text = myValue;
}
//MOZILLA/NETSCAPE support
else if (myField.selectionStart || myField.selectionStart == '0') {
var startPos = myField.selectionStart;
var endPos = myField.selectionEnd;
myField.value = myField.value.substring(0, startPos)
+ myValue
+ myField.value.substring(endPos, myField.value.length);
} else {
myField.value += myValue;
}
return 0;
}
// calling the function
//insertAtCursor(document.formtitle.fieldtitle, 'this value');

function insertImgWithCaption(myField, myIMG, imgWidth){
	var caption = prompt("Type a caption for your image","Caption");
	
	if(!imgWidth){imgWidth="240"};
	if(!caption){caption="Caption"};
	
	insertAtCursor(myField, "<div class=\"captionBox\" style=\"width:"+ imgWidth +"px\"><img src=\""+myIMG+"\" /><div class=\"caption\">"+ caption +"</div></div>");
}